Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 1 of 14 (Convertible): Other Volvo C70 I

Intermittent fault

EFI-112 Fault in engine control module (ECM)

Scheme 5

Scheme 6

1. The control module previously stored a fault.
2. Ignition on. Erase diagnostic trouble code (DTC).

Select "Continue" when the diagnostic trouble code (DTC) has been erased.

1. Continue Refer to «Information»(ref-404024-S05458992902011061000000)

Fault-tracing information

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Permanent fault

EFI-112 Fault in engine control module (ECM)

Scheme 7

1. Ignition off. Try a new control module according to «Replacing control module»(ref-404024-S13835317622011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S39417692622011061000000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

Replacing control module

Points to observe when replacing the control module

Scheme 8

1. When changing an engine control module (ECM) from one car to another, remember to note any diagnostic trouble code (DTC) (s) before removing component.
2. The engine control module (ECM) must not be removed from the car until the main relay has interrupted its power supply. This may take up to 150 seconds (Motronic 4.4) (cars with an immobilizer 245 seconds and 90 seconds for cars with Motronic 4.3) after the ignition has been switched off.
3. Always check the control module and connector on the control module box for bent or damaged pins or sockets.

Removing security strap (Motronic 4.4)

Scheme 9

As part of the anti-theft system on cars equipped with an engine immobilizer, the engine control module (ECM) box in the engine compartment is locked into place with a locking strip. The locking strip is installed with a security screw.

1. Mark up the center of the screw and drill a suitable hole for a screw puller. Insert screw puller and remove the screw.
2. Remove the security strap across the control module box cover.
3. Clean the control module box cover carefully so that no dirt or residue falls into the box when it is opened.

Removing the control module

Scheme 10

1. Check that supply from main relay has been interrupted. Easiest method is to place fingertips on idle air control (IAC) valve. When the valve stops vibrating, the main relay has cut off supply to the system.

Scheme 11

1. Open engine control module (ECM) box cover and remove Motronic 4.3/4.4 engine control module (ECM) (module nearest engine).

Installing new engine control module (ECM)

Scheme 12

Inspect connector pins and sockets for damage.

1. Install new engine control module (ECM).
2. Switch on ignition.
3. Read off any diagnostic trouble codes (DTCs).
4. Erase diagnostic trouble codes (DTCs) and reset adaptive functions according to «Erasing diagnostic trouble codes (DTCs) and resetting adaptive functions»(ref-404024-S10170345822011100700000) .

Installing security strap (Motronic 4.4)

As part of the anti-theft system on cars equipped with an engine immobilizer, the engine control module (ECM) box in the engine compartment is locked into place with a locking strip. The locking strip is installed with a security screw.

1. Locate the slit underneath the control module box with your fingers and hook the locking strip into it.
2. Fold over the locking strip and tighten the security screw (P/N 1334099-7) so that its head breaks off.

EFI-115: Injector 1; EFI-125 Injector 2; EFI-135 Injector 3; EFI-145 Injector 4; EFI-155 Injector 5

Condition

Scheme 13

The diagnostic trouble code (DTC) for that injector is stored if there is a short-circuit to ground/supply voltage or if there is an open-circuit in an injector circuit.

Substitute Value

1. idle air trim disabled
2. fuel trim disabled

Possible Source

Signal too high

1. Short-circuit to supply voltage in signal cable
2. defective injector.

Signal too low

1. short-circuit to ground in signal cable.

Signal missing

1. defective fuse 11B/2 (1998-)
2. Open-circuit in signal- or power cable
3. contact resistance in terminals
4. defective injector.

Fault symptom[s]

1. engine not firing on all cylinders. The engine may not start.

Signal missing. Intermittent fault

EFI-1X5 Injector X

Scheme 14

1. Check injector and/or engine control module (ECM) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between injector terminal 1 and main relay (2/32) terminal 3 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S35970913042011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Signal missing. Permanent fault

EFI-1X5 Injector X

Scheme 15

Scheme 16

Scheme 17

1. Ignition off.
2. Disconnect injector.
3. Ignition on. Connect a voltmeter between injector connector terminal 1 and ground.

The voltmeter should read battery voltage.

1. OK Refer to «Checking the signal cable»(ref-404024-S20964427332011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S14819897652011061000000)

Checking for an open-circuit

1. Check cable between injector terminal 1 and main relay (2/32) terminal 3 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S06032363262011061000000)

Scheme 18

1. Ignition on.
2. Injector disconnected. Connect a voltmeter between injector connector terminal 2 and ground.

The voltmeter should read approximately 6 V.

1. OK Refer to «Checking injector»(ref-404024-S13511360602011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S35063221792011061000000)

Scheme 19

1. Ignition off.
2. Injector disconnected. Connect an ohmmeter between injector connector terminals 1 and 2.

The ohmmeter should read approximately 16 ohms at 20 °C.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S02226667162011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S13645252642011061000000)

Checking for contact resistance and oxidation

The cause of the diagnostic trouble code (DTC) has been loose connections in the injector and/or engine control module (ECM) connectors.

1. Check the connectors for loose connections and remedy according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S06032363262011061000000)

Replacing component

1. Try a new injector.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S06032363262011061000000)

Scheme 20

1. Ignition off.
2. Injector disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected.
5. Ignition on. Connect a voltmeter between injector connector terminal 2 and ground.

The voltmeter should read 6 V.

1. OK Refer to «Fault-tracing information»(ref-404024-S38656278042011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S41899597902011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S06032363262011061000000)

1. 1. Activating injector 1 (EFI-115). Refer to «Verifying injector 1»(ref-404024-S07426599612011061000000)
2. 2. Activating injector 2 (EFI-125). Refer to «Verifying injector 2»(ref-404024-S06058500282011061000000)
3. 3. Activating injector 3 (EFI-135). Refer to «Verifying injector 3»(ref-404024-S08001529822011061000000)
4. 4. Activating injector 4 (EFI-145). Refer to «Verifying injector 4»(ref-404024-S16282687582011061000000)
5. 5. Activating injector 5 (EFI-155). Refer to «Verifying injector 5»(ref-404024-S18596598992011061000000)

Verifying injector 1

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector. The injector should click when it is activated.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S22503203382011061000000)

Verifying injector 2

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S22503203382011061000000)

Verifying injector 3

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S22503203382011061000000)

Verifying injector 4

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S22503203382011061000000)

Verifying injector 5

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S22503203382011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Signal too high. Intermittent fault

EFI-1X5 Injector X

Checking cables and terminals

1. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S23306815362011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Signal too high. Permanent fault

EFI-1X5 Injector X

Checking injector

1. Ignition off.
2. Disconnect injector. Connect an ohmmeter between injector connector terminals 1 and 2.

The ohmmeter should read approximately 16 ohms at 20 °C.

1. OK Refer to «Checking for a short-circuit»(ref-404024-S24333623592011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S15820597522011061000000)

Checking for a short-circuit

1. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S24904350132011061000000)

1. Try a new injector.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S24904350132011061000000)

1. 1. Activating injector 1 (EFI-115). Refer to «Verifying injector 1»(ref-404024-S35255641462011061000000)
2. 2. Activating injector 2 (EFI-125). Refer to «Verifying injector 2»(ref-404024-S15258716532011061000000)
3. 3. Activating injector 3 (EFI-135). Refer to «Verifying injector 3»(ref-404024-S22750610202011061000000)
4. 4. Activating injector 4 (EFI-145). Refer to «Verifying injector 4»(ref-404024-S37601986962011061000000)
5. 5. Activating injector 5 (EFI-155). Refer to «Verifying injector 5»(ref-404024-S03981486152011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector. The injector should click when it is activated.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S38627895162011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S38627895162011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S38627895162011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S38627895162011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S38627895162011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Signal too low. Intermittent fault

1-X-5 Injector X

1. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Scheme 21

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S12941061462011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Signal too low. Permanent fault

EFI-1X5 Injector X

Checking the signal cable

1. Check cable between injector terminal 2 and engine control module (ECM) #A10 (EFI-115), #A38 (EFI-125), #A24 (EFI-135), #A23 (EFI-145), #A9 (EFI-155) for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09320748752011061000000)

1. 1. Activating injector 1 (EFI-115). Refer to «Verifying injector 1»(ref-404024-S27699540282011061000000)
2. 2. Activating injector 2 (EFI-125). Refer to «Verifying injector 2»(ref-404024-S15258938212011061000000)
3. 3. Activating injector 3 (EFI-135). Refer to «Verifying injector 3»(ref-404024-S34929987952011061000000)
4. 4. Activating injector 4 (EFI-145). Refer to «Verifying injector 4»(ref-404024-S17498486742011061000000)
5. 5. Activating injector 5 (EFI-155). Refer to «Verifying injector 5»(ref-404024-S17410243442011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector. The injector should click when it is activated.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S32019727842011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S32019727842011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S32019727842011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S32019727842011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate injector.

Is the injector working?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S32019727842011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-121: Mass air flow (MAF) sensor, signal

Condition

Scheme 22

Diagnostic trouble code (DTC) EFI-121 is stored if the signal from the mass air flow (MAF) sensor is lower than 0.2 V or greater than 2.2 V at idling speed, or is outside its permitted range for engine speed (RPM) and throttle angle.

Substitute Value

1. the engine control module (ECM) uses engine speed (RPM) and throttle angle to determine load
2. idle air trim adaptation disabled
3. long-term fuel trim disabled
4. EVAP-diagnostic disabled.

Possible Source

Signal too high

1. short-circuit to supply voltage in signal cable
2. open-circuit in cable to signal or power ground
3. defective mass air flow (MAF) sensor
4. contact resistance in terminals.

Signal too low

1. defective fuse 11B/2 (1998-)
2. Open-circuit in signal- or power cable
3. short-circuit to ground in signal cable.
4. fresh air hose damaged or loose
5. defective mass air flow (MAF) sensor
6. contact resistance in terminals.

Fault symptom[s]

1. uneven idling and/or running

EFI-121 Mass air flow (MAF) sensor

1. Check mass air flow (MAF) sensor and engine control module (ECM) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between mass air flow (MAF) sensor terminal 1 and engine control module (ECM) #A3 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check cable between mass air flow (MAF) sensor terminal 2 and engine control module (ECM) #A5 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
4. Check cable between mass air flow (MAF) sensor terminal 4 and engine control module (ECM) #A4 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S15565943562011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-121 Mass air flow (MAF) sensor

Scheme 23

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect mass air flow (MAF) sensor. Connect an ohmmeter between mass air flow (MAF) sensor connector terminal 1 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking signal ground»(ref-404024-S17628181232011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S16656149462011061000000)

Checking control module connector

1. Ignition off.
2. Mass air flow (MAF) sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between mass air flow (MAF) sensor connector terminal 1 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking signal ground»(ref-404024-S17628181232011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S21638154042011061000000)

1. Check cable between mass air flow (MAF) sensor terminal 1 and engine control module (ECM) #A3 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

Checking signal ground

1. Ignition off.
2. Mass air flow (MAF) sensor disconnected. Connect an ohmmeter between mass air flow (MAF) sensor connector terminal 2 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S36957858322011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S12788396772011061000000)

1. Ignition off.
2. Mass air flow (MAF) sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between mass air flow (MAF) sensor connector terminal 2 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S36957858322011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S29136001392011061000000)

1. Check cable between mass air flow (MAF) sensor terminal 2 and engine control module (ECM) #A5 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

1. Ignition on.
2. Mass air flow (MAF) sensor disconnected. Connect a voltmeter between mass air flow (MAF) sensor connector terminal 4 and ground.

Voltmeter should read 0 - 1 V.

1. OK Refer to «Checking mass air flow (MAF) sensor signal»(ref-404024-S21728593072011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S03916106322011061000000)

Check cable between mass air flow (MAF) sensor terminal 4 and engine control module (ECM) #A4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

1. Continue Refer to «Checking mass air flow (MAF) sensor»(ref-404024-S03334240752011061000000)

Scheme 24

1. Ignition off.
2. Connect mass air flow (MAF) sensor.
3. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminals 2 and 4.

Voltmeter should read 0.1 - 0.2 V.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S11414300212011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S22828689702011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the mass air flow (MAF) sensor and/or the engine control module (ECM) connectors.

1. Check connectors for contact resistance and oxidation and remedy in accordance with «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

1. Try a new mass air flow (MAF) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

Checking mass air flow (MAF) sensor

1. The mass air flow (MAF) sensor may fail if there has been a short-circuit to supply voltage in the signal cable. Check mass air flow (MAF) sensor as follows
2. Ignition off.
3. Connect mass air flow (MAF) sensor.
4. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminals 2 and 4.

Voltmeter should read 0.1 - 0.2 V.

1. OK Refer to «Fault-tracing information»(ref-404024-S33925894692011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S04629907272011061000000)

Mass air flow (MAF) sensor is OK.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

1. Try a new mass air flow (MAF) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04023525972011061000000)

Verification

HINT: After carrying out the repair, check that the fault has been remedied as follows.

Scheme 25

1. Ignition off.
2. Reinstall connectors, components etc.
3. Start the engine and idle it for a minute. Read off any diagnostic trouble codes (DTCs).

If EFI-121 is stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S23494368602011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-121 Mass air flow (MAF) sensor

1. Check that the fresh air intake is intact and properly connected.
2. Check cable between main relay (2/32) terminal 3 and mass air flow (MAF) sensor terminal 3 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check cable between mass air flow (MAF) sensor terminal 4 and engine control module (ECM) #A4 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , and an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Scheme 26

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S22728563022011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-121 Mass air flow (MAF) sensor

Checking fresh air intake

1. Ignition off. Check that the fresh air intake is intact and properly connected.

Is the fresh air intake intact?

1. YES Refer to «Checking power cable»(ref-404024-S32412107932011061000000)
2. NO Refer to «Corrective action»(ref-404024-S38721197432011061000000)

Corrective action

1. Remedy as necessary.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

Checking power cable

1. Ignition off.
2. Disconnect mass air flow (MAF) sensor.
3. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminal 3 and ground.

The voltmeter should read battery voltage.

1. OK Refer to «Checking the signal cable»(ref-404024-S07429097962011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S42351186882011061000000)

1. Check cable between mass air flow (MAF) sensor terminal 3 and main relay (2/32) terminal 3 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Mass air flow (MAF) sensor disconnected. Connect an ohmmeter between mass air flow (MAF) sensor connector terminal 4 and ground.

The ohmmeter should read approximately 9 - 11 kohms.

1. OK Refer to «Checking mass air flow (MAF) sensor signal»(ref-404024-S13205150432011061000000)
2. LOW Refer to «Checking for a short-circuit»(ref-404024-S16917774122011061000000)
3. HIGH Refer to «Checking for an open-circuit»(ref-404024-S32226144182011061000000)

1. Check cable between mass air flow (MAF) sensor terminal 4 and engine control module (ECM) #A4 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

1. Check cable between mass air flow (MAF) sensor terminal 4 and engine control module (ECM) #A4 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

Checking mass air flow (MAF) sensor signal

1. Ignition off.
2. Connect mass air flow (MAF) sensor.
3. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminals 4 and 2.

The voltmeter should read approximately 0.1-0.2 V.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S22104988002011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S23153310832011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the mass air flow (MAF) sensor and/or the engine control module (ECM) connectors.

1. Check connectors for contact resistance and oxidation and remedy in accordance with «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Scheme 27

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

1. Try a new mass air flow (MAF) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S42111024342011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Reinstall connectors, components etc.
3. Start the engine and idle it for a minute. Read off any diagnostic trouble codes (DTCs).

If EFI-121 is stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S27780186172011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Faulty signal. Intermittent fault

EFI-123 Engine coolant temperature (ECT) sensor, signal

1. Check engine coolant temperature (ECT) sensor and engine control module (ECM) connectors for a loose connection according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between engine coolant temperature (ECT) sensor terminal 1 and engine control module (ECM) #A31 for a short-circuit to another cable according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Was a fault detected?

1. YES Refer to «Information»(ref-404024-S20459830692011061000000)
2. NO Refer to «Replacing component»(ref-404024-S28897779742011061000000)

1. Try a new engine coolant temperature (ECT) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S20459830692011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Faulty signal. Permanent fault

EFI-123 Engine coolant temperature (ECT) sensor, signal

Checking engine coolant temperature (ECT) sensor signal

1. Connect multimeter «9996525»(ref-403953-S26944699622011061000000) with temperature box «9995281»(ref-403953-S37524634972011061000000) and temperature sensor «9995282»(ref-403953-S16512621202011061000000) .
2. Carefully remove the expansion tank cover. WARNING: Danger - coolant is hot.
3. Clamp the hose between the radiator and thermostat housing using a hose clip and disconnect the hose from the thermostat housing.
4. Insert sensor in thermostat housing and reinstall hose.
5. Remove hose clip.
6. Start engine and run up to operating temperature. The engine should be hot enough for the thermostat to open.
7. Select Volvo Scan Tool (ST) to read off the engine coolant temperature (ECT). Check that the engine coolant temperature (ECT) is within its permitted range.

Is the temperature within its permitted range?

1. YES Refer to «Replacing component»(ref-404024-S16922443922011061000000)
2. NO Refer to «Checking engine coolant temperature (ECT) sensor»(ref-404024-S07413338362011061000000)

1. Try a new coolant thermostat.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

Checking engine coolant temperature (ECT) sensor

1. Ignition on.
2. Disconnect temperature sensor. Select Volvo Scan Tool (ST) to read off the voltage across the engine coolant temperature (ECT) sensor.

The reading should be approximately 5 V.

1. OK Refer to «Checking ground lead»(ref-404024-S03503043252011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S01648634092011061000000)

1. Ignition off.
2. Temperature sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected.
5. Ignition on. Select Volvo Scan Tool (ST) to read off the voltage across the engine coolant temperature (ECT) sensor.

The reading should be approximately 5 V.

1. OK Refer to «Fault-tracing information»(ref-404024-S37389408442011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S19054667212011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

Scheme 28

1. Check cable between engine coolant temperature (ECT) sensor terminal 1 and engine control module (ECM) #A31 for a short-circuit to another cable according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Scheme 29

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

Checking ground lead

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Temperature sensor disconnected. Connect an ohmmeter between temperature sensor connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Replacing component»(ref-404024-S31778524572011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S25975054352011061000000)

1. Try a new engine coolant temperature (ECT) sensor.

Scheme 30

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

1. Ignition off.
2. Temperature sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between temperature sensor connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S12843542462011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S35914977532011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

1. Check cable between temperature sensor terminal 2 and engine control module (ECM) #A18 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Scheme 31

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18089265192011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reconnect connectors, reinstall components etc.
3. Start engine and run to normal operating temperature. The engine should be hot enough for the thermostat to open.
4. Select the Volvo Scan Tool (ST) symbol to read off engine coolant temperature (ECT).

Is the engine coolant temperature (ECT) value within its permitted range.

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S08425075282011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-123 Engine coolant temperature (ECT) sensor, signal

1. Check engine coolant temperature (ECT) sensor and engine control module (ECM) connectors for a loose connection according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between engine coolant temperature (ECT) sensor terminal 1 and engine control module (ECM) #A31 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , and an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .
3. Check cable between engine coolant temperature (ECT) sensor terminal 2 and control module #A18 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S03447293992011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-123 Engine coolant temperature (ECT) sensor signal

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect temperature sensor. Connect an ohmmeter between temperature sensor connector terminal 2 (engine control module (ECM) side) and ground. NOTE: If the engine cooling fan runs on, it must be allowed to stop before taking resistance readings.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S15084935282011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S28722344382011061000000)

1. Ignition on.
2. Temperature sensor disconnected. Connect a voltmeter between temperature sensor connector terminals 1 and 2 (engine control module (ECM) side).

The voltmeter should read approximately 5 V.

1. OK Refer to «Checking temperature sensor resistance»(ref-404024-S06883612532011061000000)
2. LOW Refer to «Checking control module connector»(ref-404024-S08202734852011061000000)
3. HIGH Refer to «Checking for a short-circuit»(ref-404024-S35973829562011061000000)

1. Check cable between engine coolant temperature (ECT) sensor terminal 1 and engine control module (ECM) #A31 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Checking engine coolant temperature (ECT) sensor»(ref-404024-S15840949022011061000000)

1. Ignition off.
2. Temperature sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between temperature sensor connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S01251021122011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S13281208912011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

1. Check cable between temperature sensor terminal 2 and engine control module (ECM) #A18 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

Scheme 32

Scheme 33

1. Ignition off.
2. Temperature sensor disconnected. Connect an ohmmeter between temperature sensor connector terminals 1 and 2 (temperature sensor side).

The ohmmeter should read approximately 2200 ohms at +25 °C (see diagram).

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S37916669932011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S39869491992011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the engine coolant temperature (ECT) sensor connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

1. Try a new engine coolant temperature (ECT) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

HINT: The engine coolant temperature (ECT) sensor may fail if there has been a short-circuit to voltage supply in the signal cable. Check the temperature sensor as follows

1. Ignition off.
2. Temperature sensor disconnected. Connect an ohmmeter between temperature sensor connector terminals 1 and 2 (temperature sensor side).

The ohmmeter should read approximately 2200 ohms at +25 °C (see diagram).

1. OK Refer to «Fault-tracing information»(ref-404024-S23628697372011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S39932826572011061000000)

Temperature sensor is OK.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

1. Try a new engine coolant temperature (ECT) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

1. Ignition off.
2. Temperature sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected.
5. Ignition on. Connect a voltmeter between temperature sensor connector terminals 1 and 2 (engine control module (ECM) side).

The voltmeter should read approximately 5 V.

1. OK Refer to «Fault-tracing information»(ref-404024-S03609706012011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S26874603102011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

1. Check cable between temperature sensor terminal 1 and engine control module (ECM) #A31 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S29751155482011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reconnect connectors, reinstall components etc.
3. Start engine and run to normal operating temperature. The engine should be hot enough for the thermostat to open.
4. Select the Volvo Scan Tool (ST) symbol to read off engine coolant temperature (ECT).

Is the engine coolant temperature (ECT) value within its permitted range.

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S01336091462011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-123 Engine coolant temperature (ECT) sensor, signal

1. Check cable between engine coolant temperature (ECT) sensor terminal 1 and engine control module (ECM) #A31 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S40251021452011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-123 Engine coolant temperature (ECT) sensor, signal

1. Ignition on.
2. Disconnect temperature sensor. Select Volvo Scan Tool (ST) to read off the voltage across the engine coolant temperature (ECT) sensor.

The reading should be approximately 5 V.

1. OK Refer to «Replacing component»(ref-404024-S41435756222011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S13730862462011061000000)

1. Try a new engine coolant temperature (ECT) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S26997324852011061000000)

1. Check cable between temperature sensor terminal 1 and engine control module (ECM) #A31 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S26997324852011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reconnect connectors, reinstall components etc.
3. Start engine and run to normal operating temperature. The engine should be hot enough for the thermostat to open.
4. Select the Volvo Scan Tool (ST) symbol to read off engine coolant temperature (ECT).

Is the engine coolant temperature (ECT) value within its permitted range.

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S24153670772011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking common ground terminal

EFI-123, EFI-411 and EFI-251 or EFI-314

Scheme 34

This test is intended to identify faults that post more than one diagnostic trouble code (DTC). If the following diagnostic trouble codes (DTCs) with status messages have been stored, fault-tracing should be continued.

1. EFI-123 Engine coolant temperature (ECT) sensor.
2. EFI-411 Throttle position (TP) sensor.
3. EFI-251 Outside temperature sensor.
4. EFI-314 Camshaft position (CMP) sensor.

Do you want to continue testing?

1. YES Refer to «Checking for an open-circuit, contact resistance and oxidation»(ref-404024-S39111093932011061000000)
2. NO FAULT NOT FOUND: Troubleshooting has been completed.

Checking for an open-circuit, contact resistance and oxidation

Engine control module (ECM) terminal #A18 is a common ground terminal for

1. Engine coolant temperature (ECT) sensor.
2. Throttle position (TP) sensor.
3. Camshaft position (CMP) sensor.
4. Outside temperature sensor.

If there is a fault in the common cable to engine control module (ECM) #A18, several diagnostic trouble codes (DTCs) will be stored.

1. Check cable between engine control module (ECM) #A18 and one of the components for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) and for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S03806806832011061000000)

HINT: After repair, it is necessary to check that the fault has been corrected.

HINT: Perform as follows

1. Ignition off.
2. Reconnect connectors, components etc.
3. Start engine and let it run at idling speed. Read off the throttle angle.

Throttle angle should be 3-8° at CTP and 80°-90° at WOT.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S29997767652011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-123: Engine coolant temperature (ECT) sensor, signal

Condition

Diagnostic trouble code (DTC) EFI-123 is stored if the engine control module (ECM) receives a signal from the engine coolant temperature (ECT) sensor corresponding to a temperature lower than -44 °C (signal high) or higher than 148 °C (signal low).

Diagnostic trouble code (DTC) EFI-123 is stored if the set time (depending on starting temperature) between the engine being started and it reaching 28 °C is exceeded.

Substitute Value

1. at engine start, a substitute value of +20 °C is adopted, when the engine is running +83 °C is adopted
2. with ignition on the engine coolant fan operates at low-speed
3. when the engine is running the engine coolant fan operates at high-speed
4. when the engine is switched off the engine coolant fan runs on for 3 minutes.
5. idle air trim adaptation disabled
6. long-term fuel trim disabled
7. leakage diagnostic is turned off

Possible Source

Signal too high

1. short-circuit to supply voltage in signal cable
2. open-circuit in signal cable or ground lead
3. contact resistance in terminals
4. defective engine coolant temperature (ECT) sensor.

Signal too low

1. short-circuit to ground in signal cable
2. defective engine coolant temperature (ECT) sensor.

Faulty signal

1. defective engine coolant temperature (ECT) sensor
2. defective coolant thermostat
3. contact resistance in terminals
4. short-circuit between signal cable and another cable.

Fault symptom[s]

1. difficult to start in certain temperature ranges
2. with ignition on the engine coolant fan operates at low-speed
3. when the engine is running the engine coolant fan operates at high-speed
4. when the engine is switched off the engine coolant fan runs on for 3 minutes.

See Signal too high. Intermittent fault

See Signal missing. Intermittent fault

See Signal missing. Permanent fault

See Signal too high. Permanent fault

See Signal too low. Intermittent fault

See Signal too low. Permanent fault

EFI-131: Engine speed (RPM) sensor, signal missing

Condition

Scheme 35

Diagnostic trouble code (DTC) EFI-131 is stored if the engine control module (ECM) does not receive a signal from the engine speed (RPM) sensor for 10 engine revolutions.

Note. The polarity of the engine speed (RPM) sensor wiring is reversed in cars with a manual transmission with drilled holes in the flywheel rather than milled slots.

Substitute Value

no fuel injection or ignition.

Possible Source

1. open-circuit in signal cable or ground lead
2. short-circuit to ground or supply voltage in signal cable
3. contact resistance in terminals
4. defective engine speed (RPM) sensor.

Fault symptom[s]

1. engine does not start
2. engine cuts out.

EFI-131 Engine speed (RPM) sensor, signal missing

1. Check engine control module (ECM) and engine speed (RPM) sensor connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between engine speed (RPM) sensor terminal 2 and control module #A6 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check cable between engine speed (RPM) sensor terminal 1 and engine control module (ECM) #A20 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) , an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) and an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S02325754912011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-131 Engine speed (RPM) sensor, signal missing

Checking engine speed (RPM) sensor resistance

1. Ignition off.
2. Disconnect the engine speed (RPM) sensor. Connect a voltmeter between engine speed (RPM) sensor connector terminals 1 and 2 (engine control module (ECM) side).

The ohmmeter should read 200 - 500 ohms depending on engine speed (RPM) sensor temperature.

1. OK Refer to «Checking ground lead»(ref-404024-S03312301692011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S24315464402011061000000)

1. Try a new engine speed (RPM) sensor.

Scheme 36

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Engine speed (RPM) sensor disconnected. Connect an ohmmeter between engine speed (RPM) sensor connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking signal cable resistance to ground»(ref-404024-S16322417552011061000000)
2. NOT OK Refer to «Checking engine control module (ECM) ground terminals»(ref-404024-S06853304512011061000000)

Checking engine control module (ECM) ground terminals

1. Ignition off.
2. Engine speed (RPM) sensor disconnected.
3. Check engine control module (ECM) connector and ground terminals 31/32 and 31/33 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between engine speed (RPM) sensor connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking signal cable resistance to ground»(ref-404024-S16322417552011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S24637258082011061000000)

1. Check cable between engine speed (RPM) sensor connector 2 and engine control module (ECM) #A6 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

Checking signal cable resistance to ground

1. Ignition off.
2. Engine speed (RPM) sensor disconnected. Connect an ohmmeter between engine speed (RPM) sensor connector terminals 1 and 2 (engine control module (ECM) side).

The ohmmeter should read 15 - 25 kohms.

1. OK Refer to «Checking for a short-circuit to supply voltage in signal cable»(ref-404024-S10582535962011061000000)
2. LOW Refer to «Checking for a short-circuit»(ref-404024-S24659091692011061000000)
3. HIGH Refer to «Checking control module connector»(ref-404024-S04826036482011061000000)

1. Check cable between engine speed (RPM) sensor terminal 1 and control module #A20 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

1. Ignition off.
2. Engine speed (RPM) sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000)
4. Control module connected. Connect an ohmmeter between engine speed (RPM) sensor connector terminals 1 and 2 (engine control module (ECM) side).

The ohmmeter should read 15 - 25 kohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S38262417582011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S07794896582011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Check cable between engine speed (RPM) sensor terminal 1 and engine control module (ECM) #A20 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

Checking for a short-circuit to supply voltage in signal cable

1. Ignition on.
2. Engine speed (RPM) sensor disconnected. Connect a voltmeter between engine speed (RPM) sensor connector terminal 1 and 2 (control module side).

The voltmeter should read 1 - 2 V.

1. OK Refer to «Checking the engine control module (ECM) connector»(ref-404024-S32322422362011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S33329850532011061000000)

1. Check cable between engine speed (RPM) sensor terminal 1 and engine control module (ECM) #A20 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

Checking the engine control module (ECM) connector

1. Ignition off.
2. Check engine speed (RPM) sensor connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) . Try to start the engine.

Does the engine start?

1. YES Refer to «Checking for contact resistance and oxidation»(ref-404024-S24175559992011061000000)
2. NO Refer to «Checking for damage»(ref-404024-S03764925792011061000000)

The engine did not start because of loose connections in the engine speed (RPM) sensor and/or engine control module (ECM) connectors.

1. Check connectors for contact resistance and oxidation and remedy in accordance with «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

Checking for damage

1. Check carrier plate/flywheel for damage and scratches through the engine speed (RPM) sensor hole. If no faults are detected on the carrier plate/flywheel: Try a new engine speed (RPM) sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S09534591392011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reconnect connectors and reinstall components.
3. Try to start the engine.

Does the engine start?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-404024-S40818987352011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-132: Battery voltage

Condition

Scheme 37

Diagnostic trouble code (DTC) EFI-132 is stored if battery voltage is lower than 8 V (signal too low) or higher than 16 V (signal too high) after the engine has started.

Substitute Value

1. leakage diagnostic is turned off
2. heated oxygen sensor (HO2S) aging diagnostic disabled
3. pulsed secondary air injection (PAIR) diagnostic disabled.

Possible Source

1. charging system does not charge or overcharges
2. poor battery
3. contact resistance in terminals.

Fault symptom[s]

1. none.

Voltage too high. Intermittent fault

EFI-132 Battery voltage

1. Try a new charging regulator.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S24283087112011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Voltage too high. Permanent fault

EFI-132 Battery voltage

Checking charging system

1. Check the charging system for a high charge voltage.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S19242167342011061000000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

Voltage too low. Intermittent fault

EFI-132 Battery voltage

1. Check engine control module (ECM) and main relay connectors and battery and generator terminals for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between battery and engine control module (ECM) #A27 for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S12324271572011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Voltage too low. Permanent fault

EFI-132 Battery voltage

Checking battery voltage

1. Engine idling. Connect a voltmeter between the battery positive and negative terminals.

Voltmeter should read 12 - 15 V.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S31327096142011061000000)
2. NOT OK Refer to «Fault-tracing information»(ref-404024-S05241386812011061000000)

1. Check cable between battery and engine control module (ECM) #A27 for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S22545606452011061000000)

1. Check the charging system for a low charge voltage.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S22545606452011061000000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

See Signal missing. Intermittent fault

See Signal missing. Permanent fault

See Signal too high. Intermittent fault

See Signal too high. Permanent fault

See Signal too low. Intermittent fault

See Signal too low. Permanent fault

EFI-143 Front knock sensor (KS), signal; EFI-433 Rear knock sensor (KS), signal

Scheme 38

Scheme 39

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect knock sensors (KS). Knock sensor (KS) connectors are located on the cable duct in front of the engine. Connect an ohmmeter between knock sensor (KS) connector terminal 1 (EFI-143) or terminal 3 (EFI-433) and ground.

The ohmmeter should read approximately 1 Mohms.

1. OK Refer to «Information»(ref-404024-S23069188562011061000000)
2. NOT OK Refer to «Checking cables and terminals»(ref-404024-S38183961432011061000000)

1. Check cable between knock sensor (KS) terminal 1 and engine control module (ECM) #A2 (EFI-143) or #A30 (EFI-433) for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S23069188562011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-143 Front knock sensor (KS), signal; EFI-433 Rear knock sensor (KS), signal

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect knock sensors (KS). Knock sensor (KS) connectors are located on the cable duct in front of the engine. Connect an ohmmeter between knock sensor (KS) connector terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S25232372502011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S05283260612011061000000)

1. Ignition off.
2. Knock sensor (KS) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between knock sensor (KS) connector terminal 2 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S17746360272011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S28386188612011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

1. Check cable between knock sensor (KS) connector terminal 2 and engine control module (ECM) #A17 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

1. Ignition off.
2. Knock sensor (KS) disconnected. Connect an ohmmeter between knock sensor (KS) connector terminal 1 (EFI-143) or terminal 3 (EFI-433) and ground.

The ohmmeter should read approximately 1 Mohms.

1. OK Refer to «Checking front knock sensor (KS) signal»(ref-404024-S35672207302011061000000)
2. LOW Refer to «Checking for a short-circuit»(ref-404024-S13062052612011061000000)
3. HIGH Refer to «Checking control module connector»(ref-404024-S05371287762011061000000)

1. Check cable between knock sensor (KS) terminal 1 and engine control module (ECM) #A2 (EFI-143) or terminal 3 and engine control module (ECM) #A30 (EFI-433) for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Scheme 40

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

1. Ignition off.
2. Knock sensor (KS) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between knock sensor (KS) connector terminal 1 (EFI-143) or terminal 3 (EFI-433) and ground.

The ohmmeter should read approximately 1 Mohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S31048084272011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S18472623412011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

1. Check cable between knock sensor (KS) terminal 1 and engine control module (ECM) #A2 (EFI-143) or terminal 3 and engine control module (ECM) #A30 (EFI-433) for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

Checking front knock sensor (KS) signal

1. Ignition off.
2. Connect the knock sensor (KS).
3. Start engine and run to normal operating temperature.
4. Rev engine to 3500 RPM. Select Volvo Scan Tool (ST) to read off the value of the knock sensor (KS) signal.

This value should be 2 - 6 at engine speeds (RPM) above 3500 RPM.

1. OK Refer to «Checking rear knock sensor (KS) signal»(ref-404024-S34603416702011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S13840920362011061000000)

Checking rear knock sensor (KS) signal

1. Knock sensor (KS) connected.
2. Rev engine to 3500 RPM. Select Volvo Scan Tool (ST) to read off the value of the knock sensor (KS) signal.

This value should be 2 - 6 at engine speeds (RPM) above 3500 RPM.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S34595485472011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S13840920362011061000000)

The diagnostic trouble code (DTC) has been caused by loose connections in the knock sensor (KS) connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

1. Try a new knock sensor (KS).

Scheme 41

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S15294078812011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reinstall connectors, components etc.
3. Start engine and run to normal operating temperature.
4. Rev engine to 3500 RPM. Select Volvo Scan Tool (ST) to read off the value from the front knock sensor (KS).

This value should be 2-6 at engine speeds (RPM) above 3000 RPM.

1. OK Refer to «Verification, continued»(ref-404024-S15839072522011061000000)
2. NOT OK Refer to «Information»(ref-404024-S39216587772011061000000)

Verification, continued

1. Rev engine to 3500 RPM. Select Volvo Scan Tool (ST) to read off the value from the rear knock sensor (KS).

This value should be 2-6 at engine speeds (RPM) above 3000 RPM.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S39216587772011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

See Signal too low. Permanent fault

See Signal missing. Intermittent fault

See Signal missing. Permanent fault

See Signal too high. Intermittent fault

See Signal too high. Permanent fault

See Signal too low. Intermittent fault

EFI-153: Rear heated oxygen sensor (HO2S), signal

Condition

Scheme 42

The rear heated oxygen sensor (HO2S) must be at operating temperature and have the correct output voltage to affect fuel trim and monitor the three-way catalytic converter (TWC) and front heated oxygen sensor (HO2S). Monitoring of the heated oxygen sensor (HO2S) function starts approximately 3 minutes after heated oxygen sensor (HO2S) heating starts. Diagnostic trouble code (DTC) EFI-153 is stored if there is a fault in the front or rear heated oxygen sensors (HO2S) or their cabling that affects the output voltage from the rear heated oxygen sensor (HO2S).

Substitute Value

1. twin heated oxygen sensor (HO2S) control disabled
2. three-way catalytic converter (TWC) diagnostic disabled.

Possible Source

Signal too high

1. short-circuit to supply voltage in front heated oxygen sensor (HO2S) signal cable (+)
2. short-circuit to supply voltage in front heated oxygen sensor (HO2S) signal cable (-)
3. short-circuit to supply voltage in rear heated oxygen sensor (HO2S) signal cable (+)
4. short-circuit to supply voltage in rear heated oxygen sensor (HO2S) signal cable (-)
5. defective front heated oxygen sensor (HO2S)
6. defective rear heated oxygen sensor (HO2S).

Signal too low

1. short-circuit to ground in front heated oxygen sensor (HO2S) signal cable (+)
2. short-circuit to ground in front heated oxygen sensor (HO2S) signal cable (-)
3. short-circuit to ground in rear heated oxygen sensor (HO2S) signal cable (+)
4. short-circuit to ground in rear heated oxygen sensor (HO2S) signal cable (-)
5. defective front heated oxygen sensor (HO2S)
6. defective rear heated oxygen sensor (HO2S).

Signal missing

1. open-circuit in signal cable (+)
2. open-circuit in signal cable (-)
3. defective rear heated oxygen sensor (HO2S).

Faulty signal

1. signal cable (+) short-circuited to signal cable (-)
2. defective rear heated oxygen sensor (HO2S).

Fault symptom[s]

1. none.

EFI-153 Rear heated oxygen sensor (HO2S), signal

Checking cables

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for an intermittent short-circuit to the cable between front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S03742670252011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-153 Rear heated oxygen sensor (HO2S), signal

Scheme 43

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect rear heated oxygen sensor (HO2S) (gray connector). Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminals 3 and 4 (heated oxygen sensor (HO2S) side).

The ohmmeter should read 50 ohms - infinite resistance.

1. OK Refer to «Checking for a short-circuit»(ref-404024-S03659365422011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S29806943402011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A34 for a short-circuit to the cable between rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S07851113822011061000000)

1. Try a new rear heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S07851113822011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S15188523302011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-153 Rear heated oxygen sensor (HO2S), signal

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A34 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
2. Check cable between rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check engine control module (ECM) and rear heated oxygen sensor (HO2S) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S09528037632011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-153 Rear heated oxygen sensor (HO2S), signal

Scheme 44

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer approximately 245 seconds).
3. Disconnect rear heated oxygen sensor (HO2S) (gray connector). Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 50 kohms.

1. OK Refer to «Checking signal cable (-), rear heated oxygen sensor (HO2S)»(ref-404024-S38474783442011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S23223164802011061000000)

1. Ignition off.
2. Rear heated oxygen sensor (HO2S) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 50 kohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S26633400592011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S13411005422011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A34 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

Checking signal cable (-), rear heated oxygen sensor (HO2S)

1. Ignition off.
2. Rear heated oxygen sensor (HO2S) disconnected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 3 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 200 ohms.

1. OK Refer to «Checking rear heated oxygen sensor (HO2S) signal»(ref-404024-S24471310172011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S11558229122011061000000)

1. Ignition off.
2. Rear heated oxygen sensor (HO2S) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 3 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 200 ohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S21523144702011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S09948739012011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) terminal #A19 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

Checking rear heated oxygen sensor (HO2S) signal

1. Ignition off.
2. Connect the rear heated oxygen sensor (HO2S).
3. Start the engine and idle it. Use the Volvo Scan Tool (ST) to read off the value from the rear heated oxygen sensor (HO2S).

The signal should rise above its average value, (0.47 V), and settle between 0.1 - 0.9 V within approximately 10 minutes.

1. OK Refer to «Checking for damage»(ref-404024-S36384661322011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S19819807502011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the rear heated oxygen sensor (HO2S) connector.

1. Check that the pins in the connector are intact. NOTE: Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

1. Try a new rear heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S31249565952011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S34799096652011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .
2. Check cable between the front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 and the cable between the rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .
3. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and control module #A34 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S36019720472011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-212 Front heated oxygen sensor (HO2S), signal

Connector A

Special tools

See 9511351

See 9813190

Scheme 45

Is the test box connected to the control module?

1. YES Refer to «Checking the signal cable (-), front heated oxygen sensor (HO2S)»(ref-404024-S26171226342011061000000)
2. NO Refer to «Connection of break-out box to connector A (black)»(ref-404024-S15806016182011061000000)

Scheme 46

Scheme 47

1. Switch off ignition.
2. Disconnect ECM. NOTE: The ECM must not be removed from the car until the main relay has interrupted the supply. This may take up to 150 seconds after the ignition has been switched off. Plug adapter «9511351»(ref-403953-S10348238732011061000000) into ECM base and connect break-out box «9813190»(ref-403953-S32930552542011061000000) to adapter.

1. Continue Refer to «Checking ground terminals»(ref-404024-S42402847162011061000000)

Scheme 48

1. Switch off ignition.
2. Switch off all power consumers, such as interior lighting and radio. Use ohmmeter to measure resistance between battery negative terminal and #13 (#A13) on break-out box #28 (#A28) on break-out box #42 (#A42) on break-out box

Instrument should indicate approx. 0 ohms in all cases.

1. OK Refer to «Checking the signal cable (-), front heated oxygen sensor (HO2S)»(ref-404024-S26171226342011061000000)
2. NOT OK Refer to «Checking for open-circuit, contact resistance and oxidation»(ref-404024-S19768663942011061000000)

Checking for open-circuit, contact resistance and oxidation

1. Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) , and for contact resistance and oxidation as per «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
2. Check ground lead between engine and chassis for open-circuit as per «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) , and for contact resistance and oxidation as per «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Press Continue when fault is repaired.

1. Continue Refer to «Verification»(ref-404024-S16473877412011061000000)

HINT: After repair, it is necessary to check that the fault has been corrected.

HINT: Perform as described below.

1. Switch off ignition.
2. Switch off all power consumers, such as interior lighting and radio. Use ohmmeter to measure resistance between battery negative terminal and #13 (#A13) on break-out box #28 (#A28) on break-out box #42 (#A42) on break-out box

Instrument should indicate approx. 0 ohms in all cases.

1. OK Refer to «Checking the signal cable (-), front heated oxygen sensor (HO2S)»(ref-404024-S26171226342011061000000)
2. NOT OK Refer to «Information»(ref-404024-S19303653142011061000000)

Scheme 49

1. Connect control module.
2. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Checking the signal cable (+), front heated oxygen sensor (HO2S)»(ref-404024-S16028487362011061000000)
2. NOT OK Refer to «Checking front heated oxygen sensor (HO2S)»(ref-404024-S35677056052011061000000)

Checking front heated oxygen sensor (HO2S)

1. Ignition off.
2. Disconnect front heated oxygen sensor (HO2S) (black connector).
3. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Replacing component»(ref-404024-S14715828862011061000000)
2. NOT OK Refer to «Checking the rear heated oxygen sensor (HO2S)»(ref-404024-S25415740092011061000000)

1. Try a new heated oxygen sensor (HO2S).

Scheme 50

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S21271635452011061000000)

Checking the rear heated oxygen sensor (HO2S)

1. Ignition off.
2. Front heated oxygen sensor (HO2S) disconnected.
3. Disconnect rear heated oxygen sensor (HO2S) (gray connector).
4. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Replacing component»(ref-404024-S42313544872011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S24919371502011061000000)

Checking the signal cable (+), front heated oxygen sensor (HO2S)

1. Ignition on. Connect a voltmeter between terminals #32 (#A32) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Checking signal cable (+), rear heated oxygen sensor (HO2S)»(ref-404024-S36265152842011061000000)
2. NOT OK Refer to «Checking front heated oxygen sensor (HO2S)»(ref-404024-S31243557572011061000000)

1. Ignition off.
2. Disconnect front heated oxygen sensor (HO2S) (black connector).
3. Ignition on. Connect a voltmeter between terminals #32 (#A32) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Replacing component»(ref-404024-S42313544872011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S18800549782011061000000)

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and control module #A32 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S21271635452011061000000)

Checking signal cable (+), rear heated oxygen sensor (HO2S)

1. Ignition off.
2. Disconnect rear heated oxygen sensor (HO2S) (gray connector).
3. Ignition on. Connect a voltmeter between terminals #34 (#A34) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Replacing component»(ref-404024-S42313544872011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S32333996782011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and control module #A34 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S21271635452011061000000)

1. Try a new heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S21271635452011061000000)

1. Check cable between the front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 and the cable between the rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19 for a short-circuit to voltage supply according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S21271635452011061000000)

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S38374733642011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
2. Check cable between the front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 and the cable between the rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
3. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A34 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
4. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for an intermittent short-circuit to closing coil signal cable.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S30137530322011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-212 Front heated oxygen sensor (HO2S), signal

Special tools

See 9511351

See 9813190

Connection of break-out box to connector A (black)

1. Switch off ignition.
2. Disconnect ECM. NOTE: The ECM must not be removed from the car until the main relay has interrupted the supply. This may take up to 150 seconds after the ignition has been switched off. Plug adapter «9511351»(ref-403953-S10348238732011061000000) into ECM base and connect break-out box «9813190»(ref-403953-S32930552542011061000000) to adapter.

1. Continue Refer to «Checking ground terminals»(ref-404024-S15820706402011061000000)

Checking ground terminals

1. Switch off ignition.
2. Switch off all power consumers, such as interior lighting and radio. Use ohmmeter to measure resistance between battery negative terminal and #13 (#A13) on break-out box #28 (#A28) on break-out box #42 (#A42) on break-out box

Instrument should indicate approx. 0 ohms in all cases.

1. OK Refer to «Checking the signal cable (-), front heated oxygen sensor (HO2S)»(ref-404024-S18068822082011061000000)
2. NOT OK Refer to «Checking for open-circuit, contact resistance and oxidation»(ref-404024-S38681204462011061000000)

1. Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) , and for contact resistance and oxidation as per «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
2. Check ground lead between engine and chassis for open-circuit as per «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) , and for contact resistance and oxidation as per «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Press Continue when fault is repaired.

1. Continue Refer to «Verification»(ref-404024-S29208146572011061000000)

HINT: After repair, it is necessary to check that the fault has been corrected.

HINT: Perform as described below.

1. Switch off ignition.
2. Switch off all power consumers, such as interior lighting and radio. Use ohmmeter to measure resistance between battery negative terminal and #13 (#A13) on break-out box #28 (#A28) on break-out box #42 (#A42) on break-out box

Instrument should indicate approx. 0 ohms in all cases.

1. OK Refer to «Checking the signal cable (-), front heated oxygen sensor (HO2S)»(ref-404024-S18068822082011061000000)
2. NOT OK Refer to «Information»(ref-404024-S37963308902011061000000)

Checking the signal cable (-), front heated oxygen sensor (HO2S)

1. Connect control module.
2. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Checking the signal cable (+), front heated oxygen sensor (HO2S)»(ref-404024-S37350224912011061000000)
2. NOT OK Refer to «Checking front heated oxygen sensor (HO2S)»(ref-404024-S04471772682011061000000)

1. Ignition off.
2. Disconnect front heated oxygen sensor (HO2S) (black connector).
3. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Replacing component»(ref-404024-S21845525612011061000000)
2. NOT OK Refer to «Checking the rear heated oxygen sensor (HO2S)»(ref-404024-S10931150952011061000000)

1. Try a new heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S38055821562011061000000)

1. Ignition off.
2. Front heated oxygen sensor (HO2S) disconnected.
3. Disconnect rear heated oxygen sensor (HO2S) (gray connector).
4. Ignition on. Connect a voltmeter between terminals #33 (#A33) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.0 V.

1. OK Refer to «Replacing component»(ref-404024-S21845525612011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S20151083012011061000000)

1. Check cable between front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 and cable between rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A19 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S38055821562011061000000)

1. Ignition on. Connect a voltmeter between terminals #32 (#A32) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Checking signal cable (+), rear heated oxygen sensor (HO2S)»(ref-404024-S30653276162011061000000)
2. NOT OK Refer to «Checking front heated oxygen sensor (HO2S)»(ref-404024-S01355207132011061000000)

1. Ignition off.
2. Disconnect front heated oxygen sensor (HO2S) (black connector).
3. Ignition on. Connect a voltmeter between terminals #32 (#A32) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Replacing component»(ref-404024-S21845525612011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S04551478912011061000000)

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A33 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S38055821562011061000000)

1. Ignition off.
2. Disconnect rear heated oxygen sensor (HO2S) (gray connector).
3. Ignition on. Connect a voltmeter between terminals #34 (#A34) and #42 (#A42) on the breakout box.

The voltmeter should read approximately 1.5 V.

1. OK Refer to «Replacing component»(ref-404024-S21845525612011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S36193006942011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and control module #A34 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S38055821562011061000000)

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S36032395802011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

See Signal missing. Intermittent fault

See Signal missing. Permanent fault

See Signal too high. Intermittent fault

See Signal too high. Permanent fault

See Signal too low. Intermittent fault

See Signal too low. Permanent fault

EFI-212: Front heated oxygen sensor (HO2S), signal

Condition

Before fuel trim starts the front heated oxygen sensor (HO2S) must be ready - it should be at operational temperature and have the correct output voltage. Monitoring of the heated oxygen sensor (HO2S) function starts approximately 3 minutes after heated oxygen sensor (HO2S) heating starts. Diagnostic trouble code (DTC) EFI-212 is stored if there is a fault in the front or rear heated oxygen sensors (HO2S) or their cabling that affects the output voltage from the front heated oxygen sensor (HO2S).

Substitute Value

1. fuel trim disabled
2. three-way catalytic converter (TWC) diagnostic disabled.

Possible Source

Signal too high

1. short-circuit to supply voltage in front heated oxygen sensor (HO2S) signal cable (+)
2. short-circuit to supply voltage in front heated oxygen sensor (HO2S) signal cable (-)
3. short-circuit to supply voltage in rear heated oxygen sensor (HO2S) signal cable (+)
4. short-circuit to supply voltage in rear heated oxygen sensor (HO2S) signal cable (-)
5. defective front heated oxygen sensor (HO2S)
6. defective rear heated oxygen sensor (HO2S).

Signal too low

1. short-circuit to ground in front heated oxygen sensor (HO2S) signal cable (+)
2. short-circuit to ground in front heated oxygen sensor (HO2S) signal cable (-)
3. short-circuit to ground in rear heated oxygen sensor (HO2S) signal cable (+)
4. short-circuit to ground in rear heated oxygen sensor (HO2S) signal cable (-)
5. defective front heated oxygen sensor (HO2S)
6. defective rear heated oxygen sensor (HO2S).

Signal missing

1. open-circuit in signal cable (+)
2. open-circuit in signal cable (-)
3. defective front heated oxygen sensor (HO2S).

Faulty signal

1. short-circuit between signal cable (+) and signal cable (-)
2. defective front heated oxygen sensor (HO2S).

Fault symptom[s]

1. none.

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for an intermittent short-circuit to the cable between front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S12915454552011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect front heated oxygen sensor (HO2S) (black connector). Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminals 3 and 4 (heated oxygen sensor (HO2S) side).

The ohmmeter should read 50 ohms - infinite resistance.

1. OK Refer to «Checking for a short-circuit»(ref-404024-S10473004532011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S19415587812011061000000)

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for a short-circuit to the cable between front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S05995033102011061000000)

1. Try a new rear heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S05995033102011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S30392287352011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Check cable between front heated oxygen sensor (HO2S) terminal 4 and engine control module (ECM) #A32 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
2. Check cable between front heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check engine control module (ECM) and front heated oxygen sensor (HO2S) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S34533967782011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-212 Front heated oxygen sensor (HO2S), signal

1. Ignition off.
2. Wait approximately 150 seconds.
3. Disconnect front heated oxygen sensor (HO2S) (black connector). Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 50 kohms.

1. OK Refer to «Checking the signal cable (+), front heated oxygen sensor (HO2S)»(ref-404024-S10324573742011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S28756992692011061000000)

1. Ignition off.
2. Front heated oxygen sensor (HO2S) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 50 kohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S02563467782011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S03756262732011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 4 and control module #A32 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

1. Ignition off.
2. Front heated oxygen sensor (HO2S) disconnected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 3 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 200 ohms.

1. OK Refer to «Checking front heated oxygen sensor (HO2S) signal»(ref-404024-S30494946102011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S29095784142011061000000)

1. Ignition off.
2. Front heated oxygen sensor (HO2S) disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between heated oxygen sensor (HO2S) connector terminal 3 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 200 ohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S22942001542011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S42556465072011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

1. Check cable between rear heated oxygen sensor (HO2S) terminal 3 and engine control module (ECM) #A33 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

Checking front heated oxygen sensor (HO2S) signal

1. Ignition off.
2. Connect the front heated oxygen sensor (HO2S).
3. Start the engine and idle it.
4. Use the Volvo Scan Tool (ST) to read off the value from the front heated oxygen sensor (HO2S).

The signal should rise above its average value, (0.45 V), and settle between 0.1 - 0.9 V within approximately 10 minutes.

1. OK Refer to «Checking for damage»(ref-404024-S29911196412011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S21651026512011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the front heated oxygen sensor (HO2S) connector.

1. Check that the pins in the connector are intact. NOTE: Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

1. Try a new front heated oxygen sensor (HO2S).

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S11408392132011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows.

1. Ignition off.
2. Front and rear heated oxygen sensors (HO2S) connected.
3. Control module connected.
4. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
5. Start the engine and idle it.
6. Go into the Diagnostic Test Mode (DTM) menu.
7. Watch EFI-153 and EFI-212. Wait until the status of EFI-153 and EFI-212 switch to tested. This can take up to 15 minutes after the engine has been started.
8. Read off diagnostic trouble codes (DTCs). This can take up to 15 minutes after the engine has been started.

If EFI-153 or EFI-212 are stored they should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S05383864412011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

See Signal too high. Intermittent fault

See Signal too high. Permanent fault

See Signal too low. Intermittent fault

See Signal too low. Permanent fault

EFI-214: Engine speed (RPM) sensor, signal sporadic

Condition

Diagnostic trouble code (DTC) EFI-214 is stored if the engine control module (ECM) counts more than two teeth too few or too many on the carrier plate/flywheel for two consecutive crankshaft revolutions, and this fault occurs at least three times in one journey.

Substitute Value

1. none.

Possible Source

1. loose connections in the wiring or cable splices
2. cable insulation damaged
3. contact resistance in terminals
4. damage to carrier plate/flywheel
5. defective engine speed (RPM) sensor.

Fault symptom[s]

1. engine running very jerkily.

Signal sporadic. Faulty signal

EFI-214 Engine speed (RPM) sensor, signal sporadic

1. Check engine speed (RPM) sensor and engine control module (ECM) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check the cables between the engine control module (ECM) and engine speed (RPM) sensor for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) , and an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Are cables and terminals OK?

1. YES Refer to «Checking for damage»(ref-404024-S04741971242011061000000)
2. NO Refer to «Fault-tracing information»(ref-404024-S22198849722011061000000)

1. Check carrier plate/flywheel through the engine speed (RPM) sensor hole for damage and scratches.

Are there scratches on the carrier plate/flywheel?

1. YES Refer to «Fault-tracing information»(ref-404024-S22198849722011061000000)
2. NO Refer to «Replacing component»(ref-404024-S16529190792011061000000)

1. Remedy as necessary

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S29393799652011061000000)

1. Try a new engine speed (RPM) sensor.

1. Continue Refer to «Information»(ref-404024-S29393799652011061000000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

EFI-223: Idle air control (IAC) valve opening, signal EFI-245 Idle air control (IAC) valve closing, signal

Condition

Scheme 51

Diagnostic trouble code (DTC) EFI-223/EFI-245 is stored if the engine control module (ECM) registers a fault in the cable from the idle air control (IAC) valve opening/closing coil.

Substitute Value

1. idle air trim disabled
2. fuel shut-off conditions changed
3. output signals to the coils are regulated with a fixed value depending on the cause of the fault
4. leakage diagnostic is disabled.

Possible Source

Signal too high

1. short-circuit to supply voltage in the signal cable
2. defective idle air control (IAC) valve.

Signal too low

1. opening and closing coil signal cables short-circuited to each other
2. defective fuse 11B/2 (1998-)
3. open-circuit in power cable
4. short-circuit to ground in signal cable
5. defective idle air control (IAC) valve
6. contact resistance in terminals.

Signal missing

1. open-circuit in signal cable
2. defective idle air control (IAC) valve
3. contact resistance in terminals.

Fault symptom[s]

1. idling speed low or high.

EFI-223 Idle air control (IAC) valve opening, signal

1. Check idle air control (IAC) valve and engine control module (ECM) connectors for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) and loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) .
2. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S03701574502011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-223 Idle air control (IAC) valve opening, signal

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect idle air control (IAC) valve. Connect an ohmmeter between ground and idle air control (IAC) valve connector terminal 3.

The ohmmeter should read 10 - 20 kohms.

1. OK Refer to «Checking idle air control (IAC) valve»(ref-404024-S25526523452011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S15879347832011061000000)

1. Ignition off.
2. Idle air control (IAC) valve disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between ground and idle air control (IAC) valve connector terminal 3.

The ohmmeter should read 10 - 20 kohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S09665389922011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S01785915182011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

1. Continue Refer to «Verification»(ref-404024-S13764421332011061000000)

1. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13764421332011061000000)

Scheme 52

1. Ignition off.
2. Idle air control (IAC) valve disconnected. Connect an ohmmeter between idle air control (IAC) valve connector terminals 1 and 2. Read off value. Then connect an ohmmeter between idle air control (IAC) valve connector terminals 2 and 3. Read off value.

The ohmmeter should read 9 - 14 ohms at +20 °C in both cases.

1. OK Refer to «Fault-tracing information»(ref-404024-S25712903622011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S34572835902011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the idle air control (IAC) valve connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13764421332011061000000)

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13764421332011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve. The idle air control (IAC) valve should click when it is activated.

Is the idle air control (IAC) valve working?

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S20635964672011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-223 Idle air control (IAC) valve opening, signal

1. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S10676904912011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-223 Idle air control (IAC) valve opening, signal

1. Ignition off.
2. Disconnect idle air control (IAC) valve.
3. Ignition on. Connect a voltmeter between ground and idle air control (IAC) valve connector terminal 3.

The voltmeter should read less than 1 V.

1. OK Refer to «Replacing component»(ref-404024-S25164056782011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S27907061292011061000000)

1. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S19042809852011061000000)

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S19042809852011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve. The idle air control (IAC) valve should click when it is activated.

Is the idle air control (IAC) valve working?

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S34660480702011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-223 Idle air control (IAC) valve opening, signal

1. Check idle air control (IAC) valve and engine control module (ECM) connectors for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) and loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) .
2. Check cable between main relay (2/32) terminal 3 and idle air control (IAC) valve terminal 2 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
3. Check cable between idle air control (IAC) valve terminal 3 and control module #A11 for an intermittent short-circuit to supply voltage according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S00182163052011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-223 Idle air control (IAC) valve opening, signal

1. Ignition off.
2. Disconnect idle air control (IAC) valve.
3. Ignition on. Connect a voltmeter between idle air control (IAC) valve connector terminal 2 and ground.

The voltmeter should read battery voltage.

1. OK Refer to «Checking signal wiring resistance»(ref-404024-S13823452482011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S23426062312011061000000)

1. Check cable between main relay (2/32) terminal 3 and idle air control (IAC) valve terminal 2 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) . Diagnostic trouble codes (DTCs) EFI-223 and EFI-245 will be stored if there is an open-circuit in the power cable.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13000923902011061000000)

1. Check cable between idle air control (IAC) valve terminal 3 and engine control module (ECM) #A11 for a short-circuit to the cable between idle air control (IAC) valve terminal 1 and engine control module (ECM) #A25.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13000923902011061000000)

1. Check cable between idle air control (IAC) valve terminal 3 and control module #A11 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13000923902011061000000)

Checking idle air control (IAC) valve

1. Ignition off.
2. Idle air control (IAC) valve disconnected. Connect an ohmmeter between idle air control (IAC) valve connector terminals 1 and 2. Read off value.

The ohmmeter should read 9 - 14 ohms at +20 °C.

1. OK Refer to «Checking idle air control (IAC) valve»(ref-404024-S35835107712011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S28137897182011061000000)

1. Ignition off.
2. Idle air control (IAC) valve disconnected. Connect an ohmmeter between idle air control (IAC) valve connector terminals 2 and 3. Read off value.

The ohmmeter should read 9 - 14 ohms at +20 °C.

1. OK Refer to «Fault-tracing information»(ref-404024-S00089921282011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S28137897182011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the idle air control (IAC) valve connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13000923902011061000000)

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S13000923902011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition on. Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve. The idle air control (IAC) valve should click when it is activated.

Is the idle air control (IAC) valve working?

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S23066944842011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-225 Air conditioning (A/C) pressure sensor, signal

1. Check cable between connector 24/15 terminal 9 and air conditioning (A/C) compressor for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , and an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S22450672032011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-225 Air conditioning (A/C) pressure sensor, signal

Checking the air conditioning (A/C) system

See CLIMATE UNITS - GENERAL DIAGNOSTICS AND TESTS (CONVERTIBLE)

Is the air conditioning (A/C) system OK?

1. YES Refer to «Replacing component»(ref-404024-S37172064352011061000000)
2. NO Refer to «Fault-tracing information»(ref-404024-S06273711652011061000000)

1. Try a new air conditioning (A/C) pressure sensor.

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18597773372011061000000)

1. See «CLIMATE UNITS - GENERAL DIAGNOSTICS AND TESTS (CONVERTIBLE)»(ref-404016)

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S18597773372011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

Scheme 53

Scheme 54

1. Ignition off.
2. Air conditioning (A/C) pressure sensor and engine control module (ECM) connected.
3. Start the engine and idle it.
4. Air conditioning (A/C) switch on.
5. Blower fan on.
6. Wait until the air conditioning (A/C) compressor has started. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-225 is stored it should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S26282784642011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-225 Air conditioning (A/C) pressure sensor, signal

1. Check air conditioning (A/C) pressure sensor and engine control module (ECM) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , and an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) .
3. Check cable between air conditioning (A/C) pressure sensor terminal 1 and engine control module (ECM) #B28 for an intermittent short-circuit to ground according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S06364748202011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-225 Air conditioning (A/C) pressure sensor, signal

1. Ignition off.
2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
3. Disconnect the air conditioning (A/C) pressure sensor. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S38743240052011061000000)
2. NOT OK Refer to «Checking control module connector»(ref-404024-S25188565662011061000000)

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the signal cable»(ref-404024-S38743240052011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S27125450912011061000000)

1. Check cable between air conditioning (A/C) pressure sensor terminal 1 and engine control module (ECM) #B28 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S05279941162011061000000)

1. Ignition on.
2. Air conditioning (A/C) pressure sensor disconnected. Connect a voltmeter between air conditioning (A/C) pressure sensor connector 2 and ground.

The voltmeter should read approximately 0 V.

1. OK Refer to «Checking signal cable resistance»(ref-404024-S29570440892011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S12331164452011061000000)

1. Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S05279941162011061000000)

Checking signal cable resistance

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 2 and ground.

The ohmmeter should read approximately 10 kohms.

1. OK Refer to «Checking the air conditioning (A/C) pressure sensor»(ref-404024-S01684340202011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S14889521482011061000000)

1. Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S05279941162011061000000)

Checking the air conditioning (A/C) pressure sensor

1. Ignition off.
2. Connect air conditioning (A/C) pressure sensor.
3. Start the engine and idle it.
4. Air conditioning (A/C) switch on.
5. Blower fan on. Select Volvo Scan Tool (ST) to read off the value of the air conditioning (A/C) pressure sensor signal.

Voltage should increase when the air conditioning (A/C) compressor starts.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S23381851642011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S20477271562011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the air conditioning (A/C) pressure sensor connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S05279941162011061000000)

1. Try a new air conditioning (A/C) pressure sensor.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S05279941162011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Air conditioning (A/C) pressure sensor and engine control module (ECM) connected.
3. Start the engine and idle it.
4. Air conditioning (A/C) switch on.
5. Blower fan on.
6. Wait until the air conditioning (A/C) compressor has started. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-225 is stored it should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S19090629052011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-225 Air conditioning (A/C) pressure sensor, signal

1. Check air conditioning (A/C) pressure sensor and engine control module (ECM) connectors for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
2. Check cable between air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) , and an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
3. Check cable between air conditioning (A/C) pressure sensor terminal 2 and engine control module (ECM) #B9 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
4. Check cables between accelerometer terminal 1 and engine control module (ECM) #B1, atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29 and fuel tank pressure sensor terminal 1 and engine control module (ECM) #B15 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Information»(ref-404024-S00893620152011061000000)

If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

EFI-225 Air conditioning (A/C) pressure sensor, signal

1. Ignition off.
2. Disconnect the air conditioning (A/C) pressure sensor.
3. Ignition on. Connect a voltmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The voltmeter should read 5 V.

1. OK Refer to «Checking signal cable resistance»(ref-404024-S30704959662011061000000)
2. LOW Refer to «Checking power cable resistance to ground»(ref-404024-S11023149302011061000000)
3. HIGH Refer to «Checking for a short-circuit»(ref-404024-S19076894902011061000000)

The air conditioning (A/C) pressure sensor power cable is connected inside the engine control module (ECM) to the fuel tank pressure sensor, atmospheric pressure sensor and accelerometer power cables. If anything happens to any of these cables all four will be affected.

Check cables between

1. Accelerometer terminal 1 and engine control module (ECM) #B1.
2. Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
3. atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29
4. tank pressure sensor terminal 1 and engine control module (ECM) #B15.
5. for a short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 2 and ground.

The ohmmeter should read approximately 10 kohms.

1. OK Refer to «Checking the air conditioning (A/C) pressure sensor»(ref-404024-S33519006362011061000000)
2. NOT OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S07220684172011061000000)

1. Ignition off.
2. Connect air conditioning (A/C) pressure sensor.
3. Start the engine and idle it.
4. Air conditioning (A/C) switch on.
5. Blower fan on. Select Volvo Scan Tool (ST) to read off the value of the air conditioning (A/C) pressure sensor signal.

Voltage should increase when the air conditioning (A/C) compressor starts.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S20979467842011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S32353421302011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the air conditioning (A/C) pressure sensor connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

1. Try a new air conditioning (A/C) pressure sensor.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

Checking power cable resistance to ground

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected.
3. Wait for approximately 150 seconds (cars with immobilizer 245 seconds). Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

1. OK FAULT NOT FOUND: Troubleshooting has been completed.
2. LOW Refer to «Checking accelerometer»(ref-404024-S28775750672011061000000)
3. HIGH Refer to «Checking control module connector»(ref-404024-S33279113472011061000000)

Checking accelerometer

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected.
3. Disconnect accelerometer. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

1. OK Refer to «Replacing component»(ref-404024-S25293079952011061000000)
2. NOT OK Refer to «Checking atmospheric pressure sensor»(ref-404024-S17943719382011061000000)

1. Try a new accelerometer.

Scheme 55

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

Checking atmospheric pressure sensor

1. Ignition off.
2. Air conditioning (A/C) pressure sensor and accelerometer disconnected.
3. Disconnect atmospheric pressure sensor. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

1. OK Refer to «Replacing component»(ref-404024-S00831393812011061000000)
2. NOT OK Refer to «Check»(ref-404024-S09532165892011061000000)

1. Try a new atmospheric pressure sensor.

Scheme 56

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

Checking fuel tank pressure sensor

1. Ignition off.
2. Air conditioning (A/C) pressure sensor, accelerometer and atmospheric pressure sensor disconnected.
3. Disconnect fuel tank pressure sensor. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

1. OK Refer to «Replacing component»(ref-404024-S35624149592011061000000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-404024-S17301877292011061000000)

1. Try a new fuel tank pressure sensor.

Scheme 57

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

The air conditioning (A/C) pressure sensor power cable is connected inside the engine control module (ECM) to the fuel tank pressure sensor, atmospheric pressure sensor and accelerometer power cables. If anything happens to any of these cables all four will be affected.

Check cables between

1. Accelerometer terminal 1 and engine control module (ECM) #B1.
2. Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
3. atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29
4. tank pressure sensor terminal 1 and engine control module (ECM) #B15.
5. for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Select "Continue" when the fault has been remedied.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

1. Ignition off.
2. Air conditioning (A/C) pressure sensor disconnected.
3. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
4. Control module connected. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 3 and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

1. OK Refer to «Fault-tracing information»(ref-404024-S32507560212011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S41770924232011061000000)

1. The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

1. Check cable between air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29 for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

The cause of the diagnostic trouble code (DTC) has been loose connections in the air conditioning (A/C) pressure sensor connector.

1. Check connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S04973211322011061000000)

Check

Does the car have leak diagnosis?

1. YES Refer to «Checking fuel tank pressure sensor»(ref-404024-S12265184022011061000000)
2. NO Refer to «Checking for a short-circuit»(ref-404024-S17301877292011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Air conditioning (A/C) pressure sensor and engine control module (ECM) connected.
3. Start the engine and idle it.
4. Air conditioning (A/C) switch on.
5. Blower fan on.
6. Wait until the air conditioning (A/C) compressor has started. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-225 is stored it should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S31704289042011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-231: Long-term fuel trim, part load EFI-232 Long-term fuel trim, idling speed

Condition

The engine control module (ECM) receives information from the heated oxygen sensor (HO2S) about the fuel/air mixture in the idling and partial load ranges. If the fuel/air mixture deviates from lambda=1 the short-term fuel trim will compensate for this by adjusting injection time so that lambda=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. If adaptation needs to adjust to close to its maximum diagnostic trouble code (DTC) EFI-232 (idling range -0.48 ms - 0.40 ms) or diagnostic trouble code (DTC) EFI-231 (part load range factor 0.773 - 1.227) and the status message Upper limit (lean fuel/air mixture) or Lower limit (rich fuel/air mixture) will be stored.

Substitute Value

1. none.

Possible Source

UPPER LIMIT

1. defective mass air flow (MAF) sensor
2. low fuel pressure
3. air leakage
4. faulty pulsation damper
5. faulty sensor signals.

Lower limit

1. defective mass air flow (MAF) sensor
2. high fuel pressure
3. leaking injectors
4. leaking evaporative emission (EVAP) system
5. contaminated engine oil
6. oil level too high
7. faulty sensor signals.

Fault symptom[s]

1. can result in high fuel consumption
2. may result in poor performance

Lower limit

EFI-231 Long-term fuel trim, part load

Special tools

See 9814215

See 9995843

1. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminals 2 and 4.

The voltmeter should read 0.1 - 0.2 V.

1. OK Refer to «Checking for air leakage in the exhaust system»(ref-404024-S17327871552011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S13598738042011061000000)

1. Try a new mass air flow (MAF) sensor.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S01316177372011061000000)

Checking canister purge (CP) valve

1. Remove hose to intake manifold from canister purge (CP) valve. Reinstall hose after fault-tracing. When installing use pliers «9814215»(ref-403953-S21230527962011061000000) and a new hose clamp. Connect vacuum pump «9995843»(ref-403953-S06330547042011061000000) to canister purge (CP) valve connector.

Pump up a vacuum. The vacuum gauge should indicate a steady vacuum.

1. OK Refer to «Checking engine oil level»(ref-404024-S33594790242011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S12300891312011061000000)

1. Try a new canister purge (CP) valve.

Scheme 58

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S01316177372011061000000)

Checking engine oil level

Check engine oil level.

Scheme 59

The oil level should be between the MIN and MAX marks.

1. OK Refer to «Checking engine oil»(ref-404024-S39086025892011061000000)
2. NOT OK Refer to «Fault-tracing information»(ref-404024-S21246551972011061000000)

Ensure that the oil level is correct.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Checking engine oil»(ref-404024-S39086025892011061000000)

Checking engine oil

1. Start the engine and idle it for a few minutes. Use the Volvo Scan Tool (ST) to read off and note the value of the short-term fuel trim. Disconnect and plug crankcase ventilation. Read off the short-term fuel trim value again.

This value should be more or less the same.

1. OK Refer to «Connecting the breakout box»(ref-404024-S23677274982011061000000)
2. NOT OK Refer to «Fault-tracing information»(ref-404024-S32268601132011061000000)

1. This indicates that the engine oil is contaminated with fuel. Change engine oil and oil filter. Then continue with «Erasing DTCs and resetting adaptive functions»(ref-404026-S04717160782011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S01316177372011061000000)

Checking for air leakage in the exhaust system

1. Check for leakage according to «Checking for air leakage in the exhaust system»(ref-403958-S31346639232011061000000) .

Is there any air leakage?

1. YES Refer to «Checking fuel and residual pressures»(ref-404024-S27917048352011061000000)
2. NO Refer to «Verification»(ref-404024-S01316177372011061000000)

Checking fuel and residual pressures

1. Check fuel and residual pressure according to «Fuel pressure and residual pressure»(ref-438323-S17389991572011120100000) .

Is the pressure OK?

1. YES Refer to «Checking canister purge (CP) valve»(ref-404024-S40049902332011061000000)
2. NO Refer to «Verification»(ref-404024-S01316177372011061000000)

Scheme 60

1. Ignition off.
2. Disconnect control module. NOTE: The engine control module (ECM) must not be removed from the car until the main relay has interrupted its power supply. This may take up to 150 seconds after the ignition has been switched off. Cars with immobilizer 245 seconds. Connect adapter «9511351»(ref-403953-S10348238732011061000000) to engine control module (ECM) connector and connect breakout box «9813190»(ref-403953-S32930552542011061000000) to adapter.

1. Continue Refer to «Checking ground terminals»(ref-404024-S05294068512011061000000)

Scheme 61

1. Ignition off.
2. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between the battery negative terminal and: #13 (#A13) on the breakout box. #28 (#28) on the breakout box. #42 (#A42) on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Connecting the breakout box»(ref-404024-S38092092602011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S36226258882011061000000)

1. Check ground terminal 31/71 on the right side member and cables to this for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
2. Check ground lead between engine and chassis for an open-circuit according to «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000) and contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S03303642322011061000000)

HINT: After carrying out the repair check that the fault has been remedied.

Scheme 62

1. Ignition off.
2. Control module disconnected.
3. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between battery negative terminal and #13/#28/#42 on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Connecting the breakout box»(ref-404024-S38092092602011061000000)
2. NOT OK Refer to «Information»(ref-404024-S20731100802011061000000)

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

Connecting breakout box to connector B (gray)

1. Ignition off.
2. Disconnect control module. NOTE: The engine control module (ECM) must not be removed from the car until the main relay has interrupted its power supply. This may take up to 150 seconds after the ignition has been switched off. Cars with immobilizer 245 seconds. Connect adapter «9511351»(ref-403953-S10348238732011061000000) to engine control module (ECM) connector and connect breakout box «9813190»(ref-403953-S32930552542011061000000) to adapter.

Will the engine control module (ECM) be connected when readings are taken on connector B?

1. YES Refer to «Checking ground terminal #B28»(ref-404024-S18886496582011061000000)
2. NO Refer to «Verification»(ref-404024-S01316177372011061000000)

Checking ground terminal #B28

1. Ignition off.
2. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
3. Connect control module. Connect an ohmmeter between #28 (#B28) on the breakout box and battery positive terminal.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Verification»(ref-404024-S01316177372011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S27193649302011061000000)

Check ground terminal 31/71 on the right side member and cables to this for an open-circuit according to Open-circuit, permanent faults and contact resistance and oxidation according to Contact resistance and oxidation .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S31887306882011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

Scheme 63

1. Ignition off.
2. Reconnect connectors and reinstall components.
3. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode. Use the Volvo Scan Tool (ST) to read off the value of long-term fuel trim. Test drive the car. Watch the long-term fuel trim value until it switches to completed.

If diagnostic trouble code (DTC) EFI-231/232 is stored it should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S19809320222011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

HINT: After carrying out the repair check that the fault has been remedied.

1. Ignition off.
2. Control module disconnected.
3. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between battery negative terminal and #13/#28/#42 on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Verification»(ref-404024-S01316177372011061000000)
2. NOT OK Refer to «Information»(ref-404024-S33732033562011061000000)

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

UPPER LIMIT

EFI-231 and EFI-232 Long-term fuel trim, part load and idling respectively

1. Ignition on. Connect a voltmeter between mass air flow (MAF) sensor connector terminals 2 and 4.

The voltmeter should read 0.1 - 0.2 V.

1. OK Refer to «Checking for air leakage in the intake system»(ref-404024-S02349774692011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S24600191332011061000000)

1. Try a new mass air flow (MAF) sensor.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S14339239622011061000000)

Checking for air leakage in the intake system

Check for air leakage according to Check for air leaks in the intake system .

Scheme 64

Is there any air leakage?

1. YES Refer to «Verification»(ref-404024-S14339239622011061000000)
2. NO Refer to «Checking for air leakage in the exhaust system»(ref-404024-S34149801612011061000000)

Check for air leakage according to Checking for air leakage in the exhaust system .

Scheme 65

Is there any air leakage?

1. YES Refer to «Verification»(ref-404024-S14339239622011061000000)
2. NO Refer to «Checking fuel and residual pressures»(ref-404024-S17942160462011061000000)

1. Check fuel and residual pressure according to «Fuel pressure and residual pressure»(ref-438323-S17389991572011120100000) .

Scheme 66

Is fuel pressure OK?

1. YES Refer to «Checking pulsation damper»(ref-404024-S13182015772011061000000)
2. NO Refer to «Verification»(ref-404024-S14339239622011061000000)

Checking pulsation damper

1. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
2. Test drive the car.
3. Use the Volvo Scan Tool (ST) to read off the value of the short-term fuel trim and engine speed (RPM).
4. Drive the car on a flat road.
5. Maintain engine speed at 1250 RPM.
6. Watch short-term fuel trim

The value should oscillate around 1.000.

1. OK Refer to «Connecting the breakout box»(ref-404024-S32650228732011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S00966026462011061000000)

1. Try a new pulsation damper.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S14339239622011061000000)

1. Ignition off.
2. Disconnect control module. NOTE: The engine control module (ECM) must not be removed from the car until the main relay has interrupted its power supply. This may take up to 150 seconds after the ignition has been switched off. Cars with immobilizer 245 seconds. Connect adapter «9511351»(ref-403953-S10348238732011061000000) to engine control module (ECM) connector and connect breakout box «9813190»(ref-403953-S32930552542011061000000) to adapter.

Will the engine control module (ECM) be connected when readings are taken on connector B?

1. YES Refer to «Checking ground terminal #B28»(ref-404024-S05809339862011061000000)
2. NO Refer to «Verification»(ref-404024-S14339239622011061000000)

1. Ignition off.
2. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
3. Connect control module. Connect an ohmmeter between #28 (#B28) on the breakout box and battery positive terminal.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Verification»(ref-404024-S14339239622011061000000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-404024-S24808536582011061000000)

Check ground terminal 31/71 on the right side member and cables to this for an open-circuit according to Open-circuit, permanent faults and contact resistance and oxidation according to Contact resistance and oxidation .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S40164393022011061000000)

HINT: After carrying out the repair check that the fault has been remedied.

1. Ignition off.
2. Control module disconnected.
3. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between battery negative terminal and #13/#28/#42 on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

1. OK Refer to «Verification»(ref-404024-S14339239622011061000000)
2. NOT OK Refer to «Information»(ref-404024-S31692365422011061000000)

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Reconnect connectors and reinstall components.
3. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode. Use the Volvo Scan Tool (ST) to read off the value of long-term fuel trim. Test drive the car. Watch the long-term fuel trim value until it switches to completed.

If diagnostic trouble code (DTC) EFI-231/232 is stored it should have intermittent status.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S32950119462011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

See Lower limit

See UPPER LIMIT

EFI-233: Adaptive idle air trim

Condition

Diagnostic trouble code (DTC) EFI-233 is stored when the air mass through the valve increases or decreases too much, in order to hold the correct idling speed.

The permitted range for idle air trim adaptation is between +22 Kg/h (upper limit and -8 Kg/h (lower limit).

Substitute Value

1. none.

Possible Source

Upper limit

1. blocked air cleaner (ACL) or air intake
2. contact resistance in terminals
3. incorrectly adjusted throttle body
4. defective idle air control (IAC) valve

Lower limit

1. air leakage
2. contact resistance in terminals
3. incorrectly adjusted throttle body
4. defective idle air control (IAC) valve.

Fault symptom[s]

1. idling speed too high or low.

EFI-233 Adaptive idle air trim

Scheme 67

1. Ignition off. Check that seal on throttle body (TB) adjusting screw is not broken.

Is seal intact?

1. NO Refer to «Checking link rod»(ref-404024-S26571016252011061000000)
2. YES Refer to «Replacing component»(ref-404024-S25296433692011061000000)

1. Replace throttle body (TB) according to «Replacing throttle body (TB)»(ref-438282-S24272712462011120100000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S15294313922011061000000)

Checking link rod

1. Ignition off. Check that the throttle spindle is in contact with the adjustment screw and that the throttle pulley is in contact with the idling stop.

Is the throttle mechanism OK?

1. YES Refer to «Checking for air leakage»(ref-404024-S23762276882011061000000)
2. NO Refer to «Checking component»(ref-404024-S33065731242011061000000)

Checking component

1. Check and adjust throttle spindle and throttle cable according to «Replacing throttle body (TB)»(ref-438282-S24272712462011120100000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S15294313922011061000000)

Checking for air leakage

1. Ignition off. Check for air leakage according to «Check for air leaks in the intake system»(ref-403958-S26493902602011061000000) .

Is there any leakage?

1. YES Refer to «Fault-tracing information»(ref-404024-S42337715452011061000000)
2. NO Refer to «Checking idle air control (IAC) valve»(ref-404024-S38711991212011061000000)

1. Remedy as necessary.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S15294313922011061000000)

1. Ignition on. Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve.

A "clicking sound" should be heard from the valve.

1. OK Refer to «Checking idle air control (IAC) valve resistance»(ref-404024-S11371569572011061000000)
2. NOT OK Refer to «Checking the idle air control (IAC) valve connector»(ref-404024-S37776045472011061000000)

Checking the idle air control (IAC) valve connector

1. Ignition off.
2. Check idle air control (IAC) valve and engine control module (ECM) connectors for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
3. Reinstall engine control module (ECM) and idle air control (IAC) valve connectors.
4. Ignition on. Select Volvo Scan Tool (ST) to activate idle air control (IAC) valve.

A "clicking sound" should be heard from the valve.

1. OK Refer to «Checking idle air control (IAC) valve resistance»(ref-404024-S11371569572011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S23911696132011061000000)

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S15294313922011061000000)

Checking idle air control (IAC) valve resistance

1. Ignition off.
2. Disconnect idle air control (IAC) valve. Connect an ohmmeter between idle air control (IAC) valve terminals 1 and 3.

The ohmmeter should read 18 - 28 ohms at +20 °C.

1. OK Refer to «Checking throttle»(ref-404024-S05280782922011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S28264536532011061000000)

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S15294313922011061000000)

Checking throttle

1. Ignition off.
2. Remove fresh air intake between air cleaner (ACL) and throttle body (TB).
3. Check that the throttle is undamaged, that it moves properly and that it has not come away from the throttle spindle.

Is the throttle OK?

1. YES Refer to «Replacing component»(ref-404024-S28264536532011061000000)
2. NOT OK Refer to «Replacing component»(ref-404024-S25296433692011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
3. Throttle position (TP) sensor and engine control module (ECM) connected.
4. Ignition on. Go into the Diagnostic Test Mode (DTM) menu. Zero all adaptive functions but the flywheel.

1. OK Refer to «Verification, continued»(ref-404024-S17999044092011061000000)

1. Volvo Scan Tool (ST) connect to VIDA station.
2. Start the engine and run it until it reaches operating temperature, at least 85 °C.
3. Engine idling Select Volvo Scan Tool (ST) to read off the value of the idle air trim adaptation. When the idle air trim adaptation value has stabilized. Rev the engine to approximately 2000 and idle it. Wait approximately 30 seconds and read off the value again. Repeat this until the value is stable.

The value should be between -5 and 15 kg/h.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S09797200752011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

EFI-233 Adaptive idle air trim

Checking throttle body (TB)

1. Ignition off. Check that seal on throttle body (TB) adjusting screw is not broken.

Is seal intact?

1. NO Refer to «Checking the air cleaner (ACL) and air intake»(ref-404024-S24323055112011061000000)
2. YES Refer to «Replacing Throttle Body (TB)»(ref-404024-S33317240222011061000000)

Replacing Throttle Body (TB)

1. Replace throttle body (TB) according to «Replacing throttle body (TB)»(ref-438282-S24272712462011120100000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S26428547672011061000000)

Checking the air cleaner (ACL) and air intake

1. Ignition off. Check that the air cleaner (ACL), air intake and hoses and pipes between the air cleaner (ACL) and throttle body (TB) are not blocked. Check idle air control (IAC) valve terminals.

Is it OK?

1. OK Refer to «Checking idle air control (IAC) valve»(ref-404024-S12879063552011061000000)
2. NOT OK Refer to «Fault-tracing information»(ref-404024-S33255857212011061000000)

1. Remedy as necessary.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S26428547672011061000000)

1. Ignition off.
2. Disconnect idle air control (IAC) valve. Connect an ohmmeter between idle air control (IAC) valve terminals 1 and 3.

The ohmmeter should read 18 - 28 ohms at +20 °C.

1. OK Refer to «Checking the idle air control (IAC) valve control slide»(ref-404024-S24676508932011061000000)
2. NOT OK Refer to «Replacing Idle Air Control (IAC) Valve»(ref-404024-S11286303042011061000000)

Replacing Idle Air Control (IAC) Valve

1. Try a new idle air control (IAC) valve.

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S26428547672011061000000)

Scheme 68

1. Ignition off.
2. Remove idle air control (IAC) valve.
3. Hold the valve by the connector, twist the valve rapidly but carefully back and forth. Listen for the sound of the slide switching. CAUTION: Under no circumstances touch the slide with a screwdriver or other tool, as this may scratch and damage the slide.

The idle air control (IAC) valve control slide should switch.

1. OK Refer to «Checking for contact resistance and oxidation»(ref-404024-S07680828262011061000000)
2. NOT OK Refer to «Replacing Idle Air Control (IAC) Valve»(ref-404024-S11286303042011061000000)

1. Check idle air control (IAC) valve and engine control module (ECM) connectors for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .

Select "Continue" when the fault has been repaired.

1. Continue Refer to «Verification»(ref-404024-S26428547672011061000000)

HINT: After carrying out the repair, check that the fault has been remedied as follows

1. Ignition off.
2. Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
3. Throttle position (TP) sensor and engine control module (ECM) connected.
4. Ignition on. Go into the Diagnostic Test Mode (DTM) menu. Zero all adaptive functions but the flywheel.

1. OK Refer to «Verification, continued»(ref-404024-S31972943092011061000000)

1. Volvo Scan Tool (ST) connect to VIDA station.
2. Start the engine and run it until it reaches operating temperature, at least 85 °C.
3. Engine idling Select Volvo Scan Tool (ST) to read off the value of the idle air trim adaptation. When the idle air trim adaptation value has stabilized. Rev the engine to approximately 2000 and idle it. Wait approximately 30 seconds and read off the value again. Repeat this until the value is stable.

The value should be between -5 and 15 kg/h.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-404024-S08882033052011061000000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.