Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 4 of 7 (Coupe): Wiring Volvo C70 I

Checking the component, wiring and connector

Check mass air flow (MAF) sensor connector for intermittent contact resistance, oxidation according to Contact resistance and oxidation and intermittent loose connections according to Contact resistance and oxidation .

Check that there is no air leakage in the intake system or damage to hoses etc. according to Check for air leaks in the intake system .

Check signal cable between engine control module (ECM) #A22 (#22) and mass air flow (MAF) sensor #5 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check signal cable between engine control module (ECM) #A22 (#A22) and mass air flow (MAF) sensor #5 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check power supply cable between engine control module (ECM) #39 (#A39) and mass air flow (MAF) sensor #4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check power supply cable between engine control module (ECM) #A70 (#A70) and mass air flow (MAF) sensor #2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-408434-S31668912732011071200000) .
3. With the ignition on and mass air flow (MAF) sensor connector connected the voltage at mass air flow (MAF) sensor #2 should be approximately U bat , mass air flow (MAF) sensor #3 should be ground and mass air flow (MAF) sensor #5, signal cable, should be approximately 1 volt.
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Information»(ref-408508-S21529489552011071200000)

Checking component and wiring

Check that there is no air leakage in the intake system or damage to hoses etc. according to Check for air leaks in the intake system .

Check signal cable between engine control module (ECM) #A22 (#A22) and engine control module (ECM) #5 for an open circuit according to Open-circuit, permanent faults .

Check signal cable between engine control module (ECM) #A22 (#A22) and mass air flow (MAF) sensor #5 for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Check power supply cable between engine control module (ECM) #39 (#A39) and mass air flow (MAF) sensor #4 for an open-circuit according to Open-circuit, permanent faults .

Check power supply cable between engine control module (ECM) #A70 (#A70) and mass air flow (MAF) sensor #2 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-408434-S31668912732011071200000) .
3. With the ignition on and mass air flow (MAF) sensor connector connected the voltage at mass air flow (MAF) sensor #2 should be approximately U ba t, mass air flow (MAF) sensor #3 should be ground and mass air flow (MAF) sensor #5 should be approximately 1 volt.
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S25082021952011071200000)

Checking wiring and components

Check signal cable between control module #A23 (#A23) and boost pressure sensor #1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

HINT: With the ignition on and boost pressure sensor connector disconnected the voltage between #1 and ground terminal should be approximately 5 V.

Check ground lead between control module #A60 (#A60) and boost pressure sensor boost pressure sensor #2 for an open-circuit according to Open-circuit, permanent faults

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the boost pressure sensor, see «Manifold absolute pressure (MAP) sensor, replacing»(ref-408507-S11632055412011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

Scheme 925

1. Continue Refer to «Verification»(ref-408508-S32328314662011071200000)

Check signal cable between control module #A23 (#A23) and boost pressure sensor terminal 1 for a short-circuit to ground according to Short-circuit to ground, permanent faults

HINT: With the ignition on and boost pressure sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 5V.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the boost pressure sensor, see «Manifold absolute pressure (MAP) sensor, replacing»(ref-408507-S11632055412011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S31092450442011071200000)

Checking wiring and connectors

Note. This diagnostic trouble code (DTC) is stored if the engine coolant temperature (ECT) sensor freezes. This may happen if the coolant level is low or there is too little glycol in the coolant. Check the engine coolant level and its freezing point. Remedy as necessary.

Check the engine coolant temperature (ECT) sensor connector. Check for contact resistance and oxidation. See Contact resistance and oxidation . Check for loose connections. See Loose connections (terminals) .

HINT: The fault may have been caused by air pockets in the cooling system.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-438955-S32567614912011120700000)
3. For the resistance values, see «Component specifications»(ref-408451-S01696444632011071200000)
4. For information about signals see «Signal specification»(ref-408451-S42269556162011071200000) .

Scheme 926

1. Continue Refer to «Information»(ref-408508-S13854341642011071200000)

Check engine coolant temperature (ECT) sensor resistance.

Check signal cable between control module #A4 (#A4) and engine coolant temperature (ECT) sensor #1 for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-438955-S32567614912011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S18362586612011071200000)

Check signal cable between control module #A4 (#A4) and engine coolant temperature (ECT) sensor #1 for an intermittent open-circuit according to Open-circuit, intermittent faults and an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

HINT: With the ignition on and engine coolant temperature (ECT) sensor connector disconnected the voltage between #1 and ground terminal should be approximately 5 V.

Check ground lead between control module #A60 (#A60) and engine coolant temperature (ECT) sensor #2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-438955-S32567614912011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

Scheme 927

1. Continue Refer to «Information»(ref-408508-S10207129702011071200000)

Check engine coolant temperature (ECT) sensor resistance.

Note. The engine coolant temperature (ECT) sensor may be defective as a result of the signal cable having been short-circuited to supply voltage. Check this before replacing the sensor.

Check the signal cable between control module #A4 (#A4) engine coolant temperature (ECT) sensor #1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: With the ignition on and engine coolant temperature (ECT) sensor connector disconnected the voltage between #1 and ground terminal must be approximately 5V.

Check ground lead between control module #A60 (#A60) and engine coolant temperature (ECT) sensor #2 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-438955-S32567614912011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S33267675522011071200000)

Checking components and wiring

Check the resistance of the injector between terminals 1 and 2.

Check the cable between injector terminal 2 and control module

1. terminal #A16 (#A16) (ECM 2310)
2. terminal #A34 (#A34) (ECM 2320)
3. terminal #A15 (#A15) (ECM 2330)
4. terminal #A33 (#A33) (ECM 2340)
5. terminal #A14 (#A14) (ECM 2350)

and the power supply between system relay terminal 3 and injector terminal 1 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box / accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access / replace the injector, see «Injector/pulse damper, replacement»(ref-438954-S22747526282011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S37338564622011071200000)

Check injector resistance between terminals 1 and 2.

Check cable between injector terminal 2 and control module

1. #A16 (#A16) (ECM 2310)
2. #A34 (#A34) (ECM 2320)
3. #A15 (#A15) (ECM 2330)
4. #A33 (#A33) (ECM 2340)
5. #A14 (#A14) (ECM 2350)

for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Use an electrician's screwdriver with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the injector, see «Injector/pulse damper, replacement»(ref-438954-S22747526282011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S32397758032011071200000)

Check injector resistance between terminals 1 and 2.

Check cable between injector terminal 2 and control module

1. #A16 (#A16) (ECM 2310)
2. #A34 (#A34) (ECM 2320)
3. #A15 (#A15) (ECM 2330)
4. #A33 (#A33) (ECM 2340)
5. #A14(#A14) (ECM 2350)

for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the injector, see «Injector/pulse damper, replacement»(ref-438954-S22747526282011120700000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S27853460792011071200000)

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the fuel pump (FP) relay, see «Replacing relay in engine compartment central electrical unit»(ref-408433-S38188396272011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

Scheme 928

1. Continue Refer to «Information»(ref-408508-S11670826802011071200000)

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the fuel pump (FP) relay, see «Replacing relay in engine compartment central electrical unit»(ref-408433-S38188396272011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S20594929122011071200000)

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the fuel pump (FP) relay, see «Replacing relay in engine compartment central electrical unit»(ref-408433-S38188396272011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Information»(ref-408508-S02503528202011071200000)

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for a short-circuit to ground according to Short-circuit to ground, permanent faults

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for an open-circuit according to Open-circuit, permanent faults

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the fuel pump (FP) relay, see «Replacing relay in engine compartment central electrical unit»(ref-408433-S38188396272011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S08003589072011071200000)

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41) and the signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A42 (#A42). Check for a short-circuit to each other. See Short-circuit to ground, permanent faults .

Check the power supply to heated oxygen sensor (HO2S) terminal #3 and the signal cable between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A18 (#A18). Check for a short-circuit to the other heated oxygen sensor (HO2S) cables. See Short-circuit to supply voltage. Permanent faults .

Try a new heated oxygen sensor (HO2S) if the wiring is OK.

Remedy as necessary.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access or replace the heated oxygen sensor (HO2S) see «Adapter wiring switch, replacing»(ref-438955-S02798429742011120700000)
3. For information about signals see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S17892760662011071200000)

Check signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to supply voltage.

Check signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to ground.

Try a new heated oxygen sensor (HO2S) if the wiring is OK.

Remedy as necessary.

HINT: If the fault remains after fault-tracing, it may indicate that the fault is in the circuit for the rear heated oxygen sensor (HO2S).

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access or replace the heated oxygen sensor (HO2S), see «Adapter wiring switch, replacing»(ref-438955-S02798429742011120700000)
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S42449714722011071200000)

HINT: The fault may be caused by a fault in the circuit for the rear heated oxygen sensor (HO2S).

Check the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A61 (#B1). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #3 and control module terminal #A62 (#B2). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

Try a new heated oxygen sensor (HO2S) if the wiring is OK.

Remedy as necessary.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access or replace the heated oxygen sensor (HO2S), see «Adapter wiring switch, replacing»(ref-438955-S02798429742011120700000)
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000)
4. See «Contents»(ref-438953-S34713241302011120700000) .

Scheme 929

Scheme 930

1. Continue Refer to «Verification»(ref-408508-S24668289702011071200000)

Checking connector and wiring

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation and loose connections according to Loose connections (terminals)

Check signal cable (-) between heated oxygen sensor (HO2S) #5 and control module #A42 (#A42) and the cable for calibration current between heated oxygen sensor (HO2S) #2 and control module (HO2S) #A28 (#A28) for an intermittent open-circuit according to Open-circuit, intermittent faults

Check calibration current power cable between heated oxygen sensor (HO2S) #2 and control module #A28 (#A28) and power supply for pump current between heated oxygen sensor (HO2S) #6 and control module #A24 (#A24) for an intermittent short-circuit to each other according to Short-circuit to ground, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Information»(ref-408508-S39939054662011071200000)

Checking connector, wiring and components

Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation according to Contact resistance and oxidation .

Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A42 (#A42). Check the cable for calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check for an open-circuit. See Open-circuit, permanent faults .

Check the cable for the calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to each other. See Short-circuit to ground, permanent faults .

If the connector and cables are OK try a new heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access or replace the heated oxygen sensor (HO2S) see «Adapter wiring switch, replacing»(ref-438955-S02798429742011120700000)
3. For information about signals see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S05901603092011071200000)

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation and loose connections according to Loose connections (terminals)

Check the signal cable (+) between the heated oxygen sensor (HO2S) #1 and the control module #A41 (#A41), signal cable (-) between heated oxygen sensor (HO2S) #5 and the control module #A42 (#A42), calibration current power cable between the heated oxygen sensor (HO2S) #2 and the control module #A28 (#A28) and the pump current power supply cable between the heated oxygen sensor (HO2S) #6 and the control module #A24 (#A24) for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Check the signal cable (+) between the heated oxygen sensor (HO2S) #1 and the control module #A41 (#A41), the signal cable (-) between the heated oxygen sensor (HO2S) #5 and the control module #A42 (#A42), the calibration current supply cable between the heated oxygen sensor (HO2S) #2 and the control module #A28 (#A28) and the pump current supply cable between the heated oxygen sensor (HO2S) #6 and the control module #A24 (#A24) for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check signal cable (+) between heated oxygen sensor (HO2S) #1 and control module #A41 (#A41) for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Information»(ref-408508-S41774638982011071200000)

Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation. See Contact resistance and oxidation .

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A42 (#A42). Check the cable for the calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to supply voltage. See Short-circuit to supply voltage. Permanent faults .

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A42 (#A42). Check the cable for the calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to ground. See Short-circuit to ground, permanent faults .

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check for an open-circuit. See Open-circuit, permanent faults .

If the connector and cables are OK try a new heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000)
2. To access or replace the heated oxygen sensor (HO2S) see «Adapter wiring switch, replacing»(ref-438955-S02798429742011120700000)
3. For information about signals see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S28841888292011071200000)

Check the heated oxygen sensor (HO2S) resistance between #3 and #4.

Check signal cable between heated oxygen sensor (HO2S) #4 and control module #A18 (#A18) and power supply between system relay #3 and heated oxygen sensor (HO2S) #3 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S) for 5 cylinder engines, see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For resistance values, see «Component specifications»(ref-438955-S33969082952011120700000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S21658879712011071200000)

Check heated oxygen sensor (HO2S) resistance between #3 and #4.

Check signal cable between heated oxygen sensor (HO2S) #4 and control module #A18 (#A18) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

HINT: Use a test lamp with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S05159587622011071200000)

Check heated oxygen sensor (HO2S) resistance between #3 and #4.

Check signal cable between heated oxygen sensor (HO2S) #4 and engine control module #A18 (#A18) for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S17200371042011071200000)

Check the signal cable (+) between heated oxygen sensor (HO2S) #4 and control module #A61 (#B1) and the signal cable (-) between heated oxygen sensor (HO2S) #3 and control module #A62 (#B2) for an a short-circuit to ground according to Short-circuit to ground, permanent faults .

If wiring is OK, try another heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S38570112712011071200000)

Check the signal line (+) between the heated oxygen sensor #4 and the control module #A61 (#B1) as well as signal line (-) between heated oxygen sensor #3 and the control module #A62 (#B2) for open circuit, acc. to: Checking wiring and terminals. Permanent fault

If wiring is OK, try another heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S13497143132011071200000)

Check signal cable (+) between heated oxygen sensor (HO2S) #4 and control module #A61 (#B1) and signal cable (-) between heated oxygen sensor (HO2S) #3 and control module #A62 (#B2) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Use an electrician's screwdriver with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

If wiring is OK, try another heated oxygen sensor (HO2S).

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S42496317632011071200000)

Check heated oxygen sensor (HO2S) resistance between #1 and #2.

Check signal cable between heated oxygen sensor (HO2S) #2 and control module #A35 (#A35) and power supply between system relay #3 and heated oxygen sensor (HO2S) #1 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S14271237592011071200000)

Check heated oxygen sensor (HO2S) resistance between #1 and #2.

Check signal cable between heated oxygen sensor (HO2S) #2 and control module #A35 (#A35) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Use a test lamp with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S24959652882011071200000)

Check heated oxygen sensor (HO2S) resistance between #1 and #2.

Check signal cable between heated oxygen sensor (HO2S) #2 and engine control module (ECM) #A35 (#A35) for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the heated oxygen sensor (HO2S), see «Replacing lambda probes»(ref-408507-S08893976632011071200000) .
3. For resistance values, see «Component specifications»(ref-408451-S01696444632011071200000) .
4. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S08590929742011071200000)

Check engine speed (RPM) sensor connector for intermittent contact resistance and oxidation according to Contact resistance and oxidation

Check the signal cable between the engine speed (RPM) sensor #1 and the engine control module (ECM) #A48 (#A48) and between the engine speed (RPM) sensor #2 and the engine control module (ECM) #A66 (#B6) for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults , an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults and an intermittent open-circuit according to Open-circuit, intermittent faults .

Check the carrier plate, search for damage and other defects.

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the engine speed (RPM) sensor, see «Replacing the engine speed (RPM) sensor»(ref-438954-S04334598742011120700000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

Scheme 931

Scheme 932

1. Continue Refer to «Information»(ref-408508-S18351977202011071200000)

Check engine speed (RPM) sensor connector for contact resistance and oxidation according to Contact resistance and oxidation

Check the signal cable between the engine speed (RPM) sensor #1 and the engine control module (ECM) #A48 (#A48) and between the engine speed (RPM) sensor #2 and the engine control module (ECM) #A66 (#B6) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults , a short-circuit to ground according to Short-circuit to ground, permanent faults and for an open-circuit according to Open-circuit, permanent faults

Check the carrier plate, search for damage and other defects.

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the engine speed (RPM) sensor, see «Replacing the engine speed (RPM) sensor»(ref-438954-S04334598742011120700000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S24666437762011071200000)

Check signal cable between ignition coil #1 and control module

1. #A31 (#A31) (ECM 3300)
2. #A30 (#A30) (ECM 3310)
3. #A50 (#A50) (ECM 3320)
4. #A52 (#A52) (ECM 3330)
5. #A51 (#A51) (ECM 3340)

and power supply between system relay #3 and ignition coil #4 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the ignition coil, see «Replacing ignition coils»(ref-438954-S11759555062011120700000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S17219513842011071200000)

Check signal cable between ignition coil #1 and control module

1. #A31 (#A31) (ECM 3300)
2. #A30 (#A30) (ECM 3310)
3. #A50 (#A50) (ECM 3320)
4. #A52 (#A52) (ECM 3330)
5. #A51 (#A51) (ECM 3340)

and power supply between system relay #3 and ignition coil #4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Use an electrician's screwdriver with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the ignition coil, see «Replacing ignition coils»(ref-438954-S11759555062011120700000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S27529318302011071200000)

Check signal cable between ignition coil #1 and control module

1. #A31 (#A31) (ECM 3300)
2. #A30 (#A30) (ECM 3310)
3. #A50 (#A50) (ECM 3320)
4. #A52 (#A52) (ECM 3330)
5. #A51 (#A51) (ECM 3340)

for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the ignition coil, see «Replacing ignition coils»(ref-438954-S11759555062011120700000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S34354165242011071200000)

Check signal cable between knock sensor (KS) #1 and control module #A46 (#A46) and ground lead between knock sensor (KS) #2 and control module #A64 (#B4) for a short-circuit to supply voltage to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Check that knock sensor (KS) is tightened to correct torque according to Knock sensor (KS), replacing .

HINT: The diagnostic trouble code (DTC) may be caused by a worn engine. Start the engine and listen for discordant noise.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to. «Verification»(ref-408508-S19841497952011071200000)

Check knock sensor (KS) connector for contact resistance and oxidation according to Contact resistance and oxidation .

Check signal cable between knock sensor (KS) #1 and control module #A46 (#A46) and ground lead between knock sensor (KS) #2 and control module #A64 (#B4) for an open-circuit according to Open-circuit, permanent faults and for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Check that the knock sensor (KS) is tightened to the correct torque.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the knock sensor (KS), see «Knock sensor (KS), replacing»(ref-408506-S26178914172011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Checking knock sensor (KS) signal»(ref-408508-S33274358672011071200000)

Check signal cable between knock sensor (KS) #3 and control module #A45 (#A45) and ground lead between knock sensor (KS) #4 and control module #A67 (#B7) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Check that the knock sensor (KS) is tightened to the correct torque.

HINT: The diagnostic trouble code (DTC) may be caused by a worn engine. Start the engine and listen for discordant noise.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the knock sensor (KS), see «Knock sensor (KS), replacing»(ref-408506-S26178914172011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Verification»(ref-408508-S31404818362011071200000)

Check knock sensor (KS) connector for contact resistance and oxidation according to Contact resistance and oxidation .

Check the signal cable between knock sensor (KS) #3 and control module #A45 (#A45) and the ground lead between knock sensor (KS) #4 and control module #A67 (#B7) for an open-circuit according to Open-circuit, permanent faults and for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Check that the knock sensor (KS) is tightened to the correct torque.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-408435-S12899753102011071200000) .
2. To access/replace the knock sensor (KS), see «Knock sensor (KS), replacing»(ref-408506-S26178914172011071200000) .
3. For information about signals, see «Signal specification»(ref-408451-S42269556162011071200000) .

1. Continue Refer to «Checking knock sensor (KS) signal»(ref-408508-S38755543082011071200000)