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Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 4 of 14 (Convertible): Other Volvo C70 I

Testing & Diagnostics 41 illustrations ~15283 words

Signal too high. Intermittent fault

EFI-541 Canister purge (CP) valve, signal

Scheme 247

Scheme 247: Checking cables and terminals
Scheme 247: Checking cables and terminals
  1. Check cable between canister purge (CP) valve terminal 2 and engine control module (ECM) #A39 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-404032-S36570726732011061000000)

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).

Signal too high. Permanent fault

EFI-541 Canister purge (CP) valve, signal

Scheme 248

Scheme 248: Checking the signal cable
Scheme 248: Checking the signal cable

Scheme 249

Scheme 249
Scheme 249

Scheme 250

Scheme 250
Scheme 250

Scheme 251

Scheme 251
Scheme 251
  1. Ignition off.
  2. Disconnect connector from canister purge (CP) valve.
  3. Ignition on. Connect an electrician's screwdriver (3 W bulb at least) between canister purge (CP) valve connector terminal 2 and ground.

The electrician's screwdriver should not light.

  1. OK Refer to «Replacing canister purge valve»(ref-404032-S10121627982011061000000)
  2. NOT OK Refer to «Checking for a short-circuit»(ref-404032-S31386940292011061000000)

Scheme 252

Scheme 252: Checking for a short-circuit
Scheme 252: Checking for a short-circuit
  1. Check signal cable between canister purge (CP) valve connector terminal 2 and engine control module (ECM) #A39 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-404032-S05218901512011061000000)

Replacing canister purge valve

  1. Try a new canister purge (CP) valve.

Scheme 253

Scheme 253
Scheme 253

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S05218901512011061000000)

Verification

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

Scheme 254

Scheme 254
Scheme 254

Scheme 255

Scheme 255
Scheme 255

Scheme 256

Scheme 256
Scheme 256
  1. Ignition off.
  2. Canister purge (CP) valve and control module connected.
  3. Ignition on. Select Volvo Scan Tool (ST) to activate canister purge (CP) valve. The canister purge (CP) valve clicks when it is activated.

Is the canister purge (CP) valve working?

  1. OK VERIFIED: Troubleshooting has been completed.
  2. NOT OK Refer to «Information»(ref-404032-S12004506962011061000000)

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

EFI-541 Canister purge (CP) valve, signal

Checking cables and terminals

  1. Check cable between canister purge (CP) valve terminal 2 and engine control module (ECM) #A39 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-404032-S15487612732011061000000)

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-541 Canister purge (CP) valve, signal

Scheme 257

Scheme 257: Checking for a short-circuit
Scheme 257: Checking for a short-circuit
  1. Ignition off.
  2. Disconnect connector from canister purge (CP) valve. Check cable between canister purge (CP) valve terminal 2 and engine control module (ECM) #A39 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-404032-S08363368912011061000000)

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

  1. Ignition off.
  2. Canister purge (CP) valve and control module connected.
  3. Ignition on. Select Volvo Scan Tool (ST) to activate canister purge (CP) valve. The canister purge (CP) valve clicks when it is activated.

Is the canister purge (CP) valve working?

  1. OK VERIFIED: Troubleshooting has been completed.
  2. NOT OK Refer to «Information»(ref-404032-S09821896902011061000000)

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.

Misfire in one cylinder

See Misfire in one cylinder

Scheme 258

Scheme 258: Checking compression
Scheme 258: Checking compression
  1. Remove all the spark plugs. Carry out a compression test according to «Compression test»(ref-404029-S33633901992011061000000) .

Is compression correct?

  1. YES Refer to «Checking cooling system»(ref-404032-S26273639612011061000000)
  2. NO Refer to «Replacing spark plugs»(ref-404032-S11378412182011061000000)

Replacing spark plugs

  1. Remedy as necessary, then replace all spark plugs. NOTE: It is vital that the correct spark plugs are used, see parts catalogue for P/N. Check the spark gap of new plugs before they are fitted. Spark gap should be 0.7 - 0.8 mm.

Scheme 259

Scheme 259: Checking cooling system
Scheme 259: Checking cooling system
  1. Connect pressure tester «9985496»(ref-403953-S16783487572011061000000) to the expansion tank.
  2. Pump up a pressure of approximately 100 kPa. Shine a flashlight into each cylinder and check that there is no leakage between the cooling system and the cylinder.

Was there a leak?

  1. YES Refer to «Replacing spark plugs»(ref-404032-S11378412182011061000000)
  2. NO Refer to «Checking ignition cables»(ref-404032-S25414293212011061000000)

Scheme 260

Scheme 260
Scheme 260
  1. Remove all ignition cables.
  2. Check the ignition cables for damage, cracks or arcing. Then measure the resistance in each ignition cable. Resistance should be 1.5 - 4.5 kohms depending on their length, at 20 °C.

Are any of the ignition cables damaged or do any have incorrect resistance?

  1. YES Refer to «Replacing ignition cables»(ref-404032-S10019793552011061000000)
  2. NO Refer to «Checking distributor cap and rotor»(ref-404032-S10160054912011061000000)

Replacing ignition cables

  1. Replace ignition cables that are damaged or have an incorrect resistance.
  2. Check between ignition cables and distributor cap, spark plugs and ignition coil for loose connections.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking distributor cap and rotor»(ref-404032-S10160054912011061000000)

Scheme 261

Scheme 261: Checking distributor cap and rotor
Scheme 261: Checking distributor cap and rotor
  1. Remove distributor cap. Check distributor cap/rotor for damage, cracks and flashover. If a fault is suspected: Clean. Replace suspect components if necessary.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking ignition coil primary winding»(ref-404032-S42684850172011061000000)

Scheme 262

Scheme 262
Scheme 262
  1. Ignition off.
  2. Disconnect cable terminal from ignition coil terminal 15. Connect an ohmmeter between two primary winding terminals (1 and 15).

The ohmmeter should read 0.5 - 1.5 ohms at +20 °C.

  1. OK Refer to «Checking ignition coil secondary winding»(ref-404032-S17301384802011061000000)
  2. NOT OK Refer to «Replacing ignition coil»(ref-404032-S26394567502011061000000)

Replacing ignition coil

  1. try a new ignition coil.

Scheme 263

Scheme 263
Scheme 263

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking voltage drop»(ref-404032-S32161685022011061000000)

Scheme 264

Scheme 264
Scheme 264
  1. Ignition off.
  2. Disconnect ignition coil HT lead. Connect an ohmmeter between ignition coil terminal 15 and HT terminal.

The ohmmeter should read 8 - 9 kohms at +20 °C.

  1. OK Refer to «Checking voltage drop»(ref-404032-S32161685022011061000000)
  2. NOT OK Refer to «Replacing ignition coil»(ref-404032-S26394567502011061000000)

Scheme 265

Scheme 265: Checking voltage drop
Scheme 265: Checking voltage drop

Scheme 266

Scheme 266
Scheme 266

Scheme 267

Scheme 267
Scheme 267

Scheme 268

Scheme 268
Scheme 268
  1. Install new spark plugs. CAUTION: It is vital that the correct spark plugs are used, see parts catalogue for P/N. Check the spark gap of new plugs before they are fitted. Spark gap should be 0.7 - 0.8 mm.
  2. Install distributor cap and connect all ignition cables.
  3. Connect cable terminal to ignition coil.
  4. Start the engine and idle it. Connect a voltmeter between ignition coil terminal 15 and ground.

The voltmeter should read battery voltage.

  1. OK Refer to «Checking ignition discharge module (IDM) ground terminal»(ref-404032-S40943100702011061000000)
  2. NOT OK Refer to «Checking for loose connections, contact resistance and oxidation»(ref-404032-S12634033932011061000000)

Checking for loose connections, contact resistance and oxidation

  1. Check power supply terminals on central electrical unit, relay 2/31 and battery positive terminal for loose connections 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 «Checking ignition discharge module (IDM) ground terminal»(ref-404032-S40943100702011061000000)

Scheme 269

Scheme 269
Scheme 269
  1. Ignition off.
  2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
  3. Disconnect ignition discharge module (IDM). Connect an ohmmeter between ignition discharge module (IDM) connector terminal 1 and ground.

The ohmmeter should read approximately 0 ohms.

  1. OK Refer to «Checking ignition discharge module (IDM) cables and terminals»(ref-404032-S30117337142011061000000)
  2. NOT OK Refer to «Checking for contact resistance and oxidation»(ref-404032-S39204675112011061000000)

Checking for contact resistance and oxidation

  1. Check ignition discharge module (IDM) ground terminal 31/52 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 «Checking ignition discharge module (IDM) cables and terminals»(ref-404032-S30117337142011061000000)

Checking ignition discharge module (IDM) cables and terminals

  1. Check cables between the following components 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) .
  2. ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11
  3. ignition discharge module (IDM) terminal 1 and ground terminal 31/52
  4. ignition discharge module (IDM) terminal 3 and battery positive terminal
  5. Check the following 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-S41958999262011061000000) .
  6. ignition discharge module (IDM)
  7. engine control module (ECM)
  8. central electrical unit.
  9. relay 2/31
  10. battery positive terminal
  11. ground terminal 31/52
  12. Remedy if necessary.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking flywheel/pulse wheel»(ref-404032-S41206341632011061000000)

Checking flywheel/pulse wheel

  1. Start the engine and idle it.
  2. Select Volvo Scan Tool (ST) to read off the values for flywheel adaptation B, C, D and E.

Values should be between -0.39 and +0.387.

  1. OK Refer to «Checking injector power supply»(ref-404032-S16334252742011061000000)
  2. NOT OK Refer to «Checking for damage»(ref-404032-S11103894592011061000000)

Checking for damage

  1. Check engine speed (RPM) sensor probe and the hole to the flywheel/carrier plate for damage, scratches and swarf. If the engine speed (RPM) sensor and hole are OK: Try a new flywheel, reset adaptation.

Scheme 270

Scheme 270
Scheme 270

Checking injector power supply

  1. Check cables between injector terminal 1 and main relay (2/32) terminal 3 and engine control module (ECM) #A41 and main relay (2/32) terminal 1 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
  2. Check injector, main relay (2/32) and engine control module (ECM) 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) .

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking fuel pump (FP) cables and terminals»(ref-404032-S27986766432011061000000)

Checking fuel pump (FP) cables and terminals

  1. Check cables between the following components 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) .
  2. engine control module (ECM) #B27 and fuel pump (FP) relay terminal 4.
  3. fuel pump (FP) relay terminal 2 and ground terminal 31/51.
  4. battery positive terminal and fuel pump (FP) relay terminal 1.
  5. fuel pump (FP) relay terminal 3 and fuel pump (FP) terminal 1.
  6. fuel pump (FP) terminal 2 and ground terminal 31/48.
  7. Check terminals on the following components 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) .
  8. engine control module (ECM)
  9. fuel pump (FP) relay.
  10. ground terminal 31/51
  11. central electrical unit.
  12. relay 2/31
  13. battery positive terminal
  14. connectors 24/2 and 24/4.
  15. fuel pump (FP) connector C/BA and ground terminal 31/48.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Checking for air leakage»(ref-404032-S10495504042011061000000)

Checking for air leakage

Check for air leakage according to Check for air leaks in the intake system .

Remedy as necessary.

  1. Continue Refer to «Checking engine oil level»(ref-404032-S35888606472011061000000)

Scheme 271

Scheme 271
Scheme 271
  1. Ignition off. Check engine oil level.

The oil level should be between the MIN and MAX marks.

  1. OK Refer to «Checking fuel and residual pressures»(ref-404032-S23429656032011061000000)
  2. NOT OK Refer to «Ensuring correct oil level»(ref-404032-S41533153832011061000000)

Checking fuel and residual pressures

  1. Check fuel and residual pressure according to «Check for air leaks in the intake system»(ref-403958-S26493902602011061000000) and «Checking for air leakage in the exhaust system»(ref-403958-S31346639232011061000000) .

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Information»(ref-404032-S22488012072011061000000)

Ensuring correct oil level

  1. Ensure that the oil level is correct.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Information»(ref-404032-S22488012072011061000000)

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.

Misfire in several cylinders

See Misfire in several cylinders

See Misfire in one cylinder

See Misfire in one cylinder

See Misfire in one cylinder

See Misfire in one cylinder

See Misfire in one cylinder

Signal sporadic: Intermittent fault

EFI-422 Atmospheric pressure sensor, signal

  1. Check fuel tank 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 fuel tank pressure sensor terminal 1 and engine control module (ECM) #B15 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) .
  3. Check cable between fuel tank pressure sensor terminal 3 and engine control module (ECM) #B31 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) .
  4. Check cable between fuel tank pressure sensor terminal 2 and engine control module (ECM) #B28 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
  5. The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the air conditioning (A/C) 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: - air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29. - atmospheric pressure sensor terminal 1 and engine control module (ECM) #B15 - accelerometer terminal 1 and engine control module (ECM) #B1. for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) and an intermittent short-circuit to ground «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Information»(ref-404032-S23453203332011061000000)

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 sporadic: Permanent fault

EFI-621 Fuel tank pressure sensor, signal

  1. The diagnostic trouble code (DTC) has been caused by poor contact in the fuel tank pressure sensor and/or engine control module (ECM) connectors.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)
  1. Check fuel tank pressure sensor and/or engine control module (ECM) connector for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) .
  2. Check cable between fuel tank pressure sensor terminal 1 and engine control module (ECM) #B29 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) .
  3. Check the cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B22 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) .
  4. Check cable between fuel tank pressure sensor terminal 2 and engine control module (ECM) #B28 for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
  5. The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the air conditioning (A/C) pressure sensor, fuel tank pressure sensor and accelerometer power cables. If anything happens to any of these cables all four will be affected. Check cables between: - air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29. - atmospheric pressure sensor terminal 1 and engine control module (ECM) #B15 - accelerometer terminal 1 and engine control module (ECM) #B1 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage. Permanent faults»(ref-403956-S06473788552011061000000) and an intermittent short-circuit to ground «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
  6. Reinstall all components.
  7. Start the engine and idle it.
  8. Wait 5 minutes. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK Refer to «Verification»(ref-404032-S35340973662011061000000)
  2. NOT OK Refer to «Checking the air conditioning (A/C) pressure sensor»(ref-404032-S11419702382011061000000)

Checking the air conditioning (A/C) pressure sensor

  1. Ignition off.
  2. Fuel tank pressure sensor connected
  3. Disconnect air conditioning (A/C) pressure sensor. HINT: Diagnostic trouble codes (DTCs) may be stored for the air conditioning (A/C) pressure sensor; erase codes when fault-tracing is completed.
  4. Start the engine and idle it.
  5. Wait 5 minutes. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK Refer to «Replacing air conditioning pressure sensor»(ref-404032-S24320534572011061000000)
  2. NOT OK Refer to «Checking accelerometer»(ref-404032-S12296833392011061000000)

Replacing air conditioning pressure sensor

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

Scheme 272

Scheme 272
Scheme 272

Select "Continue" when the fault has been repaired.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)

Checking accelerometer

  1. Ignition off.
  2. Fuel tank pressure sensor connected
  3. Connect air conditioning (A/C) pressure sensor.
  4. Disconnect accelerometer. HINT: Diagnostic trouble codes (DTCs) may be stored for the accelerometer; erase codes when fault-tracing is completed.
  5. Start the engine and idle it.
  6. Wait 5 minutes. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK Refer to «Replacing accelerometer»(ref-404032-S17444689142011061000000)
  2. NOT OK Refer to «Checking atmospheric pressure sensor»(ref-404032-S01785250332011061000000)

Replacing accelerometer

  1. Try a new accelerometer.

Scheme 273

Scheme 273
Scheme 273

Select "Continue" when the fault has been repaired.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)

Checking atmospheric pressure sensor

  1. Ignition off.
  2. Fuel tank pressure sensor connected
  3. Connect the accelerometer.
  4. Disconnect atmospheric pressure sensor. HINT: Diagnostic trouble codes (DTCs) may be stored for the atmospheric pressure sensor; erase codes when fault-tracing is completed.
  5. Start the engine and idle it.
  6. Wait 5 minutes. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK Refer to «Replacing atmospheric pressure sensor»(ref-404032-S40937500112011061000000)
  2. NOT OK Refer to «Replacing accelerometer»(ref-404032-S27777240872011061000000)
  1. Try a new accelerometer.

Select "Continue" when the fault has been repaired.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)

Replacing atmospheric pressure sensor

  1. Try a new atmospheric pressure sensor.

Scheme 274

Scheme 274
Scheme 274

Select "Continue" when the fault has been repaired.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)
  1. Try a new air conditioning (A/C) pressure sensor.

Scheme 275

Scheme 275
Scheme 275

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S35340973662011061000000)

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

Scheme 276

Scheme 276
Scheme 276
  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.
  4. Test drive the car.
  5. Use the Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK VERIFIED: Troubleshooting has been completed.
  2. NOT OK Refer to «Information»(ref-404032-S31550085332011061000000)

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-621 Fuel tank pressure sensor, signal

  1. Check fuel tank pressure sensor and control module connectors and connectors 24/2 and 24/4 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 tank pressure sensor terminal 3 and engine control module (ECM) #B31 via connector 24/4 terminal E5 and connector 24/2 terminal C6 for an intermittent short-circuit to supply voltage according to «Short-circuit to supply voltage, intermittent faults»(ref-403956-S21794317742011061000000) and an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-403956-S42386577882011061000000) .
  3. Check cable between tank pressure sensor terminal 2 and engine control module (ECM) #B28 via connector 24/4 terminal E6 and connector 24/2 terminal C7 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-404032-S39156143632011061000000)

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-621 Fuel tank pressure sensor, signal

Checking ground lead

  1. Ignition off.
  2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
  3. Disconnect tank pressure sensor. Connect an ohmmeter between fuel tank pressure sensor 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-404032-S26747389122011061000000)
  2. NOT OK Refer to «Checking connector 24/4»(ref-404032-S22754548392011061000000)

Checking connector 24/4

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Check connector 24/4 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  4. Assemble connector 24/4. Connect an ohmmeter between fuel tank pressure 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-404032-S07024531042011061000000)
  2. NOT OK Refer to «Checking ground lead between connector 24/4 and fuel tank pressure sensor»(ref-404032-S31967738552011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.

Scheme 277

Scheme 277
Scheme 277

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)

Checking ground lead between connector 24/4 and fuel tank pressure sensor

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Disassemble connector 24/4. Connect an ohmmeter between connector 24/4 terminal E6 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S10306696202011061000000)
  2. NOT OK Refer to «Checking connector 24/2»(ref-404032-S05438875302011061000000)

Checking for an open-circuit

  1. Check cable between fuel tank pressure sensor terminal 2 and connector 24/4 terminal C6 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-404032-S25324247712011061000000)

Checking connector 24/2

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/4 disassembled.
  4. Check connector 24/2 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Assemble connector 24/2. Connect an ohmmeter between connector 24/4 terminal E6 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

  1. OK Refer to «Fault-tracing information»(ref-404032-S15465284172011061000000)
  2. NOT OK Refer to «Checking ground lead between connectors 24/2 and 24/4»(ref-404032-S24435424252011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)

Checking ground lead between connectors 24/2 and 24/4

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Assemble connector 24/4.
  4. Separate connector 24/2. Connect an ohmmeter between connector 24/4 terminal C7 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S07533863402011061000000)
  2. NOT OK Refer to «Checking control module connector»(ref-404032-S09949447292011061000000)
  1. Check cable between connector 24/2 terminal C7 and connector 24/4 terminal C6 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-404032-S25324247712011061000000)

Checking control module connector

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/2 disassembled.
  4. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Control module connected. Connect an ohmmeter between connector 24/2 terminal C7 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0 ohms.

  1. OK Refer to «Fault-tracing information»(ref-404032-S24509537622011061000000)
  2. NOT OK Refer to «Checking for an open-circuit»(ref-404032-S21593613752011061000000)
  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 remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)
  1. Check cable between connector 24/2 terminal C7 and engine control module (ECM) 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-404032-S25324247712011061000000)

Checking the signal cable

  1. Ignition on.
  2. Tank pressure sensor disconnected. Connect a voltmeter between fuel tank pressure sensor connector terminal 3 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Checking fuel tank pressure sensor»(ref-404032-S32387012842011061000000)
  2. LOW Refer to «Checking connector 24/4»(ref-404032-S41283188652011061000000)
  3. HIGH Refer to «Checking signal cable between connector 24/4 and fuel tank pressure sensor»(ref-404032-S20412871402011061000000)

Checking signal cable between connector 24/4 and fuel tank pressure sensor

  1. Ignition on.
  2. Tank pressure sensor disconnected.
  3. Disassemble connector 24/4. Connect a voltmeter between connector 24/4 terminal E5 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S37569418692011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and 24/2»(ref-404032-S14195020552011061000000)

Checking for a short-circuit

  1. Check cable between fuel tank pressure sensor terminal 3 and connector 24/4 terminal E5 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-404032-S25324247712011061000000)

Checking signal cable between connector 24/4 and 24/2

  1. Ignition on.
  2. Tank pressure sensor disconnected.
  3. Assemble connector 24/4.
  4. Disassemble connector 24/2. Connect a voltmeter between connector 24/2 terminal C6 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S38276278982011061000000)
  2. NOT OK Refer to «Checking for a short-circuit»(ref-404032-S18896918202011061000000)
  1. Check cable between connector 24/2 terminal C7 and connector 24/4 terminal E5 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-404032-S25324247712011061000000)
  1. Check cable between connector 24/2 terminal C7 and engine control module (ECM) #B3 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-404032-S25324247712011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Check connector 24/4 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  4. Assemble connector 24/4.
  5. Ignition on. Connect a voltmeter between fuel tank pressure sensor connector terminal 3 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S21385107352011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and fuel tank pressure sensor»(ref-404032-S05346348092011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Disassemble connector 24/4. Connect a voltmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S30658170632011061000000)
  2. NOT OK Refer to «Checking connector 24/2»(ref-404032-S39303950142011061000000)
  1. Check cable between fuel tank pressure sensor terminal 3 and connector 24/4 terminal E5 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-404032-S25324247712011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/4 disassembled.
  4. Check connector 24/2 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Assemble connector 24/2.
  6. Ignition on. Connect a voltmeter between connector 24/4 terminal E5 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S32493040202011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and 24/2»(ref-404032-S14650658422011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)
  1. Ignition on.
  2. Tank pressure sensor disconnected.
  3. Assemble connector 24/4.
  4. Disassemble connector 24/2. Connect a voltmeter between connector 24/2 terminal C6 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S08498244222011061000000)
  2. NOT OK Refer to «Checking control module connector»(ref-404032-S15863900472011061000000)
  1. Check cable between connector 24/2 terminal C6 and connector 24/4 terminal E5 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-404032-S25324247712011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/2 disassembled.
  4. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Control module connected.
  6. Ignition on. Connect a voltmeter between connector 24/2 terminal C6 and ground.

The voltmeter should read approximately 5 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S38048969472011061000000)
  2. NOT OK Refer to «Checking for an open-circuit»(ref-404032-S19424800752011061000000)
  1. The diagnostic trouble code (DTC) was caused by loose connections in the engine control module (ECM) connector.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)
  1. Check cable between connector 24/2 terminal C6 and engine control module (ECM) #B31 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-404032-S25324247712011061000000)

Checking fuel tank pressure sensor

  1. Ignition off.
  2. Connect fuel tank pressure sensor.
  3. Start the engine and idle it for a minute. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

Has the diagnostic trouble code (DTC) "Permanent" status?

  1. YES Refer to «Replacing fuel tank pressure sensor»(ref-404032-S16138722252011061000000)
  2. NO Refer to «Checking for contact resistance and oxidation»(ref-404032-S07854885682011061000000)

Replacing fuel tank pressure sensor

  1. Try a new fuel tank pressure sensor.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S25324247712011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in the fuel tank pressure sensor connector. 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-404032-S25324247712011061000000)

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

  1. Ignition off.
  2. Ensure that fuel tank pressure sensor, air conditioning (A/C) pressure sensor, accelerometer and engine control module (ECM) are connected.
  3. Connectors 24/2 and 24/4 connected.
  4. Ignition on. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK VERIFIED: Troubleshooting has been completed.
  2. NOT OK Refer to «Information»(ref-404032-S00553264322011061000000)

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-621 Fuel tank pressure sensor, signal

  1. Check fuel tank pressure sensor and control module connectors and connectors 24/2 and 24/4 for loose connections according to «Loose connections (terminals)»(ref-403956-S28513979592011061000000) and «Contact resistance and oxidation»(ref-403956-S32156020042011061000000) .
  2. Check cable between tank pressure sensor terminal 3 and engine control module (ECM) #B31 via connector 24/4 terminal E5 and connector 24/2 terminal C6 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
  3. Check cable between tank pressure sensor terminal 1 and engine control module (ECM) #B15 via connector 24/4 terminal E4 and connector 24/2 terminal C5 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) and an intermittent open-circuit.
  4. Check cable between accelerometer terminal 1 and engine control module (ECM) #B1 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
  5. Check cable between air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29 for an intermittent short-circuit to ground according to «Short-circuit to ground, intermittent faults»(ref-403956-S15751886532011061000000) .
  6. Check cable between atmospheric pressure sensor terminal 1 and engine control module (ECM) #B29 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-404032-S04638503502011061000000)

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-621 Fuel tank pressure sensor, signal

Checking power cable

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

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Checking the signal cable»(ref-404032-S29512088612011061000000)
  2. NOT OK Refer to «Checking power cable resistance»(ref-404032-S32643047082011061000000)

Checking power cable resistance

  1. Ignition off.
  2. Tank pressure sensor disconnected. Connect an ohmmeter between fuel tank pressure sensor connector terminal 1 (engine control module (ECM) side) 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 connector 24/4»(ref-404032-S35603153072011061000000)
  3. HIGH Refer to «Checking power cables»(ref-404032-S37388474872011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Check connector 24/4 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  4. Assemble connector 24/4. Connect an ohmmeter between fuel tank pressure sensor connector terminal 1 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Fault-tracing information»(ref-404032-S15784125582011061000000)
  2. NOT OK Refer to «Checking power cable between connector 24/4 and fuel tank pressure sensor»(ref-404032-S28202066532011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)

Checking power cable between connector 24/4 and fuel tank pressure sensor

  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Disassemble connector 24/4. Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S21294664422011061000000)
  2. NOT OK Refer to «Checking connector 24/2»(ref-404032-S15931990452011061000000)
  1. Check cable between fuel tank pressure sensor terminal 1 and connector E4 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-404032-S15504171222011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/4 disassembled.
  4. Check connector 24/2 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Assemble connector 24/2. Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Fault-tracing information»(ref-404032-S28914044212011061000000)
  2. NOT OK Refer to «Checking power cable between connector 24/4 and 24/2»(ref-404032-S09533574132011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)

Checking power cable between connector 24/4 and 24/2

  1. Ignition off.
  2. Disassemble connector 24/2. Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S21570744412011061000000)
  2. NOT OK Refer to «Checking control module connector»(ref-404032-S13276062452011061000000)
  1. Check cable between connector 24/2 terminal C5 and connector 24/4 terminal E4 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-404032-S15504171222011061000000)

Scheme 278

Scheme 278
Scheme 278
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/4 disassembled.
  4. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Connect control module. Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Fault-tracing information»(ref-404032-S28354378812011061000000)
  2. NOT OK Refer to «Checking for an open-circuit»(ref-404032-S27766375542011061000000)
  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 remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Check cable between connector 24/2 terminal C5 and engine control module (ECM) #B15 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-404032-S15504171222011061000000)

Checking power cables

  1. Ignition off.
  2. Disassemble connector 24/4. Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S29144718322011061000000)
  2. NOT OK Refer to «Checking cable between 24/2 and 24/4»(ref-404032-S24091999222011061000000)
  1. Check cable between connector 24/4 terminal E4 and fuel tank pressure sensor terminal 1 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-404032-S15504171222011061000000)

Checking cable between 24/2 and 24/4

  1. Ignition off.
  2. Disassemble connector 24/2. Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.

The ohmmeter should read approximately 0.2 - 1.5 kohms.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S26925654842011061000000)
  2. NOT OK Refer to «Check»(ref-404032-S28812308222011061000000)
  1. Check cable between connector 24/2 terminal C5 and connector 24/4 terminal E4 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-404032-S15504171222011061000000)

Check

Does the car have air conditioning (A/C)?

  1. YES Refer to «Checking the air conditioning (A/C) pressure sensor»(ref-404032-S25638625332011061000000)
  2. NO Refer to «Checking accelerometer»(ref-404032-S03482405162011061000000)
  1. Ignition off.
  2. Assemble connectors 24/2 and 24/4.
  3. Tank pressure sensor disconnected.
  4. Disconnect the air conditioning (A/C) pressure sensor. Connect an ohmmeter between fuel tank pressure sensor connector 1 and ground.

The ohmmeter should read 0.2 - 1.5 kohms.

  1. OK Refer to «Replacing air conditioning pressure sensor»(ref-404032-S38142758292011061000000)
  2. NOT OK Refer to «Checking accelerometer»(ref-404032-S03482405162011061000000)
  1. Try a new air conditioning (A/C) pressure sensor.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Air conditioning (A/C) pressure sensor disconnected.
  4. Disconnect accelerometer. Connect an ohmmeter between fuel tank pressure sensor connector 1 and ground.

The ohmmeter should read 0.2 - 1.5 kohms.

  1. OK Refer to «Replacing accelerometer»(ref-404032-S16976952852011061000000)
  2. NOT OK Refer to «Checking atmospheric pressure sensor»(ref-404032-S27232998172011061000000)
  1. Try a new accelerometer.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Air conditioning (A/C) pressure sensor disconnected.
  4. Accelerometer disconnected.
  5. Disconnect atmospheric pressure sensor. Connect an ohmmeter between fuel tank pressure sensor connector 1 and ground.

The ohmmeter should read 0.2 - 1.5 kohms.

  1. OK Refer to «Replacing atmospheric pressure sensor»(ref-404032-S36083466302011061000000)
  2. NOT OK Refer to «Checking for a short-circuit»(ref-404032-S30721763102011061000000)
  1. Try a new atmospheric pressure sensor.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)

The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the accelerometer, atmospheric pressure sensor and air conditioning (A/C) pressure sensor power cables. If anything happens to any of these cables all four will be affected. Air conditioning (A/C) pressure sensor wiring is pre-routed, even on cars without air conditioning, and should always be checked.

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-404032-S15504171222011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Ignition on. Connect a voltmeter between tank pressure sensor connector terminal 3 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Checking fuel tank pressure sensor»(ref-404032-S08089889522011061000000)
  2. NOT OK Refer to «Checking signal cable resistance to ground»(ref-404032-S41063934472011061000000)

Checking signal cable resistance to ground

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

Does the ohmmeter read infinite resistance?

  1. YES Refer to «Checking connector 24/4»(ref-404032-S12254783102011061000000)
  2. NO Refer to «Checking signal cable between fuel tank pressure sensor and connector 24/4»(ref-404032-S36271479072011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Check connector 24/4 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  4. Assemble connector 24/4.
  5. Ignition on. Connect a voltmeter between tank pressure sensor connector terminal 3 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S41582569692011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and fuel tank pressure sensor»(ref-404032-S12614186602011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Tank pressure sensor disconnected.
  2. Disassemble connector 24/4.
  3. Ignition on. Connect a voltmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S37728002962011061000000)
  2. NOT OK Refer to «Checking connector 24/2»(ref-404032-S08633173802011061000000)
  1. Check cable between fuel tank pressure sensor terminal 3 and connector 24/4 terminal E5 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-404032-S15504171222011061000000)
  1. Ignition off.
  2. Tank pressure sensor disconnected.
  3. Connector 24/4 disassembled.
  4. Check connector 24/2 for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Assemble connector 24/2.
  6. Ignition on. Connect a voltmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S06525494692011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and 24/2»(ref-404032-S10577635432011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Disassemble connector 24/2.
  2. Ignition on. Connect a voltmeter between connector 24/2 terminal C6 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Checking for an open-circuit»(ref-404032-S35008449132011061000000)
  2. NOT OK Refer to «Checking control module connector»(ref-404032-S04476991832011061000000)
  1. Check cable between connector 24/2 terminal C6 and connector 24/4 terminal E5 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-404032-S15504171222011061000000)
  1. Ignition off.
  2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
  3. Connector 24/2 disassembled.
  4. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  5. Connect control module.
  6. Ignition on. Connect a voltmeter between connector 24/2 terminal C6 (engine control module (ECM) side) and ground.

The voltmeter should read approximately 6 V.

  1. OK Refer to «Fault-tracing information»(ref-404032-S04425097112011061000000)
  2. NOT OK Refer to «Checking for an open-circuit»(ref-404032-S40203052822011061000000)
  1. The diagnostic trouble code (DTC) was caused by loose connections in the engine control module (ECM) connector.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Check cable between connector 24/2 terminal C6 and engine control module (ECM) #B31 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-404032-S15504171222011061000000)

Checking signal cable between fuel tank pressure sensor and connector 24/4

  1. Ignition off.
  2. Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
  3. Disassemble connector 24/4. Connect an ohmmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.

The ohmmeter should read between 0.5 Mohms and infinite resistance.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S08294346392011061000000)
  2. NOT OK Refer to «Checking signal cable between connector 24/4 and 24/2»(ref-404032-S25614709852011061000000)
  1. Check cable between fuel tank pressure sensor terminal 3 and connector 24/4 terminal E5 for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-403956-S06142553522011061000000) .

Scheme 279

Scheme 279
Scheme 279

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. Ignition off.
  2. Disassemble connector 24/2. Connect an ohmmeter between connector 24/2 terminal C6 (engine control module (ECM) side) and ground.

The ohmmeter should read between 0.5 Mohms and infinite resistance.

  1. OK Refer to «Checking for a short-circuit»(ref-404032-S12675074922011061000000)
  2. NOT OK Refer to «Checking for a short-circuit»(ref-404032-S16013307322011061000000)
  1. Check cable between connector 24/4 terminal E5 and connector 24/2 terminal C6 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-404032-S15504171222011061000000)
  1. Check signal cable between connector 24/2 terminal C6 and control module #B31 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-404032-S15504171222011061000000)
  1. Ignition off.
  2. Connect fuel tank pressure sensor.
  3. Start the engine and idle it for a minute. Select Volvo Scan Tool (ST) to read off diagnostic trouble code (DTC).

Has the diagnostic trouble code (DTC) "Permanent" status?

  1. YES Refer to «Replacing fuel tank pressure sensor»(ref-404032-S12686629972011061000000)
  2. NO Refer to «Checking for contact resistance and oxidation»(ref-404032-S03063721222011061000000)
  1. Try a new fuel tank pressure sensor.

Select "Continue" when the fault has been remedied.

  1. Continue Refer to «Verification»(ref-404032-S15504171222011061000000)
  1. The diagnostic trouble code (DTC) has been caused by loose connections in the fuel tank pressure sensor connector. 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-404032-S15504171222011061000000)

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

  1. Ignition off.
  2. Ensure that fuel tank pressure sensor, air conditioning (A/C) pressure sensor, accelerometer and engine control module (ECM) are connected.
  3. Connectors 24/2 and 24/4 connected.
  4. Ignition on. Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

  1. OK VERIFIED: Troubleshooting has been completed.
  2. NOT OK Refer to «Information»(ref-404032-S04003157252011061000000)

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.

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S04569007632011061000000)

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).

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S33588340052011061000000)

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/signal too low. Intermittent fault

See Signal too high/signal too low. Intermittent fault

See Signal too high/signal too low. Intermittent fault

Replacing the engine control module

  1. Ignition off. The control module has registered an internal fault. Try a new control module according to «Replacing the engine control module (ECM)»(ref-404033-S08158354962011061000000) . NOTE: When replacing a control module the new software must be programmed into the control module.
  1. Continue Refer to «Information»(ref-404032-S40843948432011061000000)

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.

  1. Ignition off. The control module has registered an internal fault. Try a new control module according to «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000) . NOTE: When replacing a control module the new software must be programmed into the control module.
  1. Continue Refer to «Information»(ref-404032-S19573418822011061000000)

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.

Signal too high/signal too low. Permanent fault

See Signal too high/signal too low. Permanent fault

See Signal too high/signal too low. Permanent fault

  1. Ignition off. The control module has registered an internal fault. Try a new control module according to «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000) . NOTE: When replacing a control module the new software must be programmed into the control module.
  1. Continue Refer to «Information»(ref-404032-S13187031932011061000000)

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S12782409022011061000000)

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).

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.

  1. Ignition off. The control module has registered an internal fault. Try a new control module according to «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000) . NOTE: When replacing a control module the new software must be programmed into the control module.
  1. Continue Refer to «Information»(ref-404032-S20291883882011061000000)

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S14065357042011061000000)

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).

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.

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S07252397262011061000000)

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).

Control module previously registered a fault. The fault is now no longer present.

  1. Continue Refer to «Information»(ref-404032-S05341103482011061000000)

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).

Determining the status

Reading off Diagnostic trouble code (DTC) status ECM-100A

Note. When reading off the diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

  1. Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).

Was the status of the relevant diagnostic trouble code (DTC) permanent?

  1. YES Refer to «Checking the connectors»(ref-404032-S03765571072011061000000)
  2. NO Refer to «Checking the connectors»(ref-404032-S39563430402011061000000)

Checking the connectors

Check the pressure sensor connector for intermittent contact resistance and oxidation. See Contact resistance and oxidation .

Other information

  1. To locate the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000)
  2. To access and replace the engine control module (ECM), see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
  3. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000) .
  1. Continue Refer to «Information»(ref-404032-S39273733332011061000000)
  1. Ignition off
  2. Check the connector for the intake manifold pressure sensor for contact resistance and oxidation. See «Contact resistance and oxidation»(ref-403956-S41958999262011061000000)
  3. Reinstall the components, reconnect the connectors etc. Other information To locate the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000) To access and replace the engine control module (ECM), see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000) For information about signals see «Signal specification»(ref-403973-S19941283772011061000000) .

Has the fault been found and remedied?

  1. YES Refer to «Verification»(ref-404032-S28647511282011061000000)
  2. NO Refer to «Checking the pressure sensors»(ref-404032-S10305454572011061000000)

Checking the pressure sensors

  1. Ignition on
  2. Read off both the pressure in the intake manifold and the atmospheric pressure
  3. Compare the read off values. The difference between these values must not be greater than 70 hPa. If the difference between the read off pressure values is less than 70 hPa, the cause of the fault was loose connections in the connector. If the difference is in excess of 70 hPa, check which of the sensors probably gave an incorrect value. Other information To locate the pressure sensors, see «Location of components»(ref-403970-S02481495422011061000000) Normal atmospheric pressure is 1013 hPa. Select an alternative The difference between the read off pressure values is < 70 hPa Refer to «Checking the connectors»(ref-404032-S39563430402011061000000) The atmospheric pressure sensor seems to be faulty Refer to «Replacing the atmospheric pressure sensor»(ref-404032-S36681405772011061000000) The manifold absolute pressure (MAP) sensor seems to be faulty. Refer to «Replacing the manifold absolute pressure (MAP) sensor»(ref-404032-S02137532702011061000000)

Which alternative is correct?

Replacing the manifold absolute pressure (MAP) sensor

To locate the manifold absolute pressure (MAP) sensor, see Location of components .

Remedy as necessary.

Other information

  1. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
  2. For the normal values for the manifold absolute pressure (MAP) sensor, see «Air pressure sensor intake manifold (MAP)»(ref-403971-S24151482382011061000000) .
  1. Continue Refer to «Verification»(ref-404032-S28647511282011061000000)

Replacing the atmospheric pressure sensor

Replace the engine control module (ECM). See Replacing the engine control module (ECM) .

Note. The atmospheric pressure sensor is built into the engine control module (ECM) and cannot be replaced separately.

CAUTIONNew engine control modules (ECM) are supplied without software. The engine control module (ECM) must be programmed when it has been replaced.

Remedy as necessary.

  1. Continue Refer to «Verification»(ref-404032-S28647511282011061000000)

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

  1. Ignition off
  2. Reinstall the connectors, components etc.
  3. Ignition on
  4. Read off the value for the manifold absolute pressure (MAP) sensor and the value for the atmospheric pressure sensor
  5. The difference between these values must not be greater than 70 hPa.

Is the difference between the pressure sensors less than 70 hPa?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S11146103732011061000000)

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).

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 components and connectors

Check the connector for the outside temperature sensor. Check for contact resistance and oxidation.

The sensor may be defective if the above fault tracing and corrective action does not remedy the fault.

Remedy as necessary.

Other information

  1. To access and replace the outside temperature sensor for the C70, see «Replacing sensor»(ref-403985-S15776512902011061000000)
  2. See «Contents»(ref-438291-S00903409402011120100000) .

Scheme 280

Scheme 280
Scheme 280
  1. Continue Refer to «Verification»(ref-404032-S27914632752011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S01869521412011061000000)

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. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S07941235732011061000000)

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 the outside temperature sensor

  1. Ignition on. Read off the external temperature sensor's signal by clicking on the symbol for VCT2000. Compare with table in link below. Other information: See «Outer temperature sensor»(ref-438318-S05560076662011120100000) See «Location of components»(ref-403970-S02481495422011061000000) See «Signal specification»(ref-403973-S19941283772011061000000)

Is the signal OK?

  1. YES Refer to «Signal too high. Intermittent fault»(ref-404032-S08857765652011061000000)
  2. NO Refer to «Checking connector»(ref-404032-S39654239012011061000000)

Checking connector

  1. Ignition off. Check outside temperature sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) . Remedy as necessary. Other information: To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000) .
  1. Continue Refer to «Checking wiring and components»(ref-404032-S42317930902011061000000)

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).

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S25741431352011061000000)

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.

Engine control module (ECM), replacing

Special tools

9995722

Points to observe when replacing the control module

CAUTIONNew software can only be ordered when the control module is installed in the vehicle. VIDA reads off the new control module identity which is required to order the correct software. The software can only be ordered when the new control module is installed in the car.
CAUTIONWait 2 minutes after the ignition has been switched off. The main relay must be voltage-free before the control module can be removed from the car. If the engine cooling fan runs on after the ignition has been switched off, wait until it stops and then wait for another 2 minutes.
CAUTIONAlways check that the control module and control module box connector pins and sleeves are not bent or damaged. This may have caused the fault.

Scheme 281

Scheme 281: Removing the engine control module (ECM)
Scheme 281: Removing the engine control module (ECM)
  1. Ignition off. Wait for 2 minutes
  2. Remove the cover over the control module box. Put the cover to one side NOTE: Do not touch the control module terminal pins with your fingers. Static electricity may damage components in the control module.
  3. Insert tool «9995722»(ref-403953-S10522720692011061000000) around the control module.
  4. Move the upper section of the tool backwards as far as it will go. Pull up the tool
  5. Carefully pull up the control module.

Scheme 282

Scheme 282: Installing the engine control module (ECM)
Scheme 282: Installing the engine control module (ECM)
  1. Check that no pins or sockets are damaged on the connector.
  2. Carefully press the control module down into the grooves on the inside of the control module box. Press to the limit position
  3. Insert tool «9995722»(ref-403953-S10522720692011061000000) around the control module.
  4. Move the upper section of the tool forwards as far as it will go. Pull up the tool
  5. Press the cover into place over the control modules
  6. Check that the air ducts are correctly positioned.

Ordering software

Order the software according to the tables below.

S608645426
V70 20009494715
S809438288

Petrol

S608645427
V70 20009494716
S809438289

Diesel

Finishing

Check that no diagnostic trouble codes have been stored during the repair.

Test drive the car. Check the function of the engine.

Checking cables and connectors

Check signal cable between control module #B29 (#B39) and outside temperature sensor #1 for an intermittent short-circuit to ground 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-403956-S37247582692011061000000) .
  2. To access/replace the outside temperature sensor, see «Outside temperature sensor»(ref-403985-S29568340922011061000000) .
  3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 283

Scheme 283
Scheme 283

Scheme 284

Scheme 284
Scheme 284
  1. Continue Refer to «Information»(ref-404032-S09814699852011061000000)

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).

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).

See Signal too high. Intermittent fault

See Signal too high. Intermittent fault

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S12725608592011061000000)

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. Permanent fault

See Signal too high. Permanent fault

Checking the connector

  1. Ignition off
  2. Check the wiring and connectors. Check for contact resistance and oxidation
  3. Reinstall the components, reconnect the connectors etc.
  4. Ignition on
  5. Read off the outside temperature. If the temperature is now within its permitted range, the fault was caused by loose connections in the connector. Other information To access and replace the outside temperature sensor, see «Replacing sensor»(ref-403985-S15776512902011061000000) .

Is the temperature within its permitted range?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking components and wiring»(ref-404032-S22194414922011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S18551381872011061000000)

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.

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).

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S10848591092011061000000)

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.

Check outside temperature sensor connector for contact resistance and oxidation according to Contact resistance and oxidation and loose connections according to Loose connections (terminals)

Check signal cable between control module #B29 (#B39) and outside temperature #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

Check ground lead between control module #B2 (#B12) and outside temperature 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-403956-S37247582692011061000000) .
  2. To access/replace the outside temperature sensor, see «Outside temperature sensor»(ref-403985-S29568340922011061000000) .
  3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .
  1. Continue Refer to «Information»(ref-404032-S14778707102011061000000)

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).

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).

See Signal too low. Intermittent fault

See Signal too low. Intermittent fault

  1. Ignition off
  2. Check wiring and connectors for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  3. Reinstall components, reconnect connectors etc.
  4. Ignition on.
  5. Read off outside temperature. If the temperature is now within its permitted range, the fault was caused by loose connections in the connector. Other information To access/replace the outside temperature sensor see «Outside temperature sensor»(ref-403985-S29568340922011061000000) .

Is the signal OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking wiring and components»(ref-404032-S00868893142011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on.
  4. Read off outside temperature.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S21792118942011061000000)

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 too low. Permanent fault

Checking outside temperature sensor function

  1. Ignition on. Read off the outside temperature in Volts. Check that it is correct according to the table: «Outside temperature sensor»(ref-438318-S28420353452011120100000) . Other information For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000) .

Is the temperature reading OK?

  1. YES Refer to «Faulty signal. Intermittent fault»(ref-404032-S38689364512011061000000)
  2. NO Refer to «Checking connector»(ref-404032-S27429918632011061000000)
  1. Ignition off.
  2. Check outside temperature sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  1. Continue Refer to «Checking outside temperature sensor function»(ref-404032-S26866236632011061000000)
  1. Reinstall components, reconnect connectors etc.
  2. Ignition on. Read off the outside temperature in Volts. Check that the outside temperature is correct according to the table values: «Outside temperature sensor»(ref-438318-S28420353452011120100000) . If the temperature is now OK it means that the fault was caused by loose connections in the connector. Other information: To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000) For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) To access the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000) To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000) .

Is the temperature reading OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking components»(ref-404032-S18460994762011061000000)

Checking components

Check outside temperature sensor resistance. For resistance values, see Outside temperature sensor .

Remedy as necessary.

Other information

  1. To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000)
  2. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
  3. To access the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
  4. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000) .
  1. Continue Refer to «Verification»(ref-404032-S29099411432011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Ignition on. Read off the outside temperature in Volts. Check that the outside temperature is correct. Compare the measured values with the values in the tables: «Outside temperature sensor»(ref-438318-S28420353452011120100000) .

Is the temperature reading OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S06238537182011061000000)

Faulty signal. Intermittent fault

Check outside temperature sensor connector for intermittent contact resistance and oxidation according to Contact resistance and oxidation .

Remedy as necessary.

Other information

  1. To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000)
  2. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
  3. To access the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
  4. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000) .

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.

  1. Ignition off
  2. Check the intake air temperature (IAT) sensor connector and terminal. Check for contact resistance and oxidation. If no errors are found and the fault returns as a permanent fault, replace the intake air temperature (IAT) sensor Remedy as necessary. Other information For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000) See «Contents»(ref-438291-S00903409402011120100000) .
  1. Continue Refer to «Verification»(ref-404032-S10234975452011061000000)

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

  1. Ignition off
  2. Reconnect the connectors, reinstall components etc.
  3. Start the engine. Allow the engine to idle for 5 minutes
  4. Read off diagnostic trouble codes (DTCs). The fault has been remedied if status of the diagnostic trouble code (DTC) is intermittent.

Is the status of the diagnostic trouble code (DTC) intermittent?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S06005732532011061000000)

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.

  1. Ignition off.
  2. Check the mass air flow (MAF) sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) . The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor. Other information: To access / replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

Is the signal OK?

  1. YES Refer to «Verification»(ref-404032-S25375198842011061000000)
  2. NO Refer to «Checking the intake air temperature (IAT) sensor signal»(ref-404032-S00724496682011061000000)

Checking the intake air temperature (IAT) sensor signal

  1. Ignition on.
  2. Engine running.
  3. Read off the intake air temperature (IAT) sensor signal. Check that the signal is OK according to the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) . If the signal is now OK, the fault was caused by poor contact in the connector. Other information: To access / replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

Is the signal OK?

  1. YES Refer to «Verification»(ref-404032-S25375198842011061000000)
  2. NO Refer to «Checking wiring and components»(ref-404032-S13597674042011061000000)

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).

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

  1. Ignition off.
  2. Reconnect the connectors, reinstall components etc.
  3. Ignition on.
  4. Read off Intake Air Temperature (IAT) sensor signal. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor. Check that the signal is OK according to the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) .

Is the signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S26556658082011061000000)

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.

Check signal cable between control module #A5 (#A5) and intake air temperature (IAT) sensor connector #1 to ground for an intermittent short-circuit 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-403956-S37247582692011061000000) .
  2. To access/replace the Intake Air Temperature (IAT) sensor see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-404035-S20199659872011061000000) .
  3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 285

Scheme 285
Scheme 285
  1. Continue Refer to «Information»(ref-404032-S17473110862011061000000)

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).

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).

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).

See Signal too high. Intermittent fault

See Signal too high. Intermittent fault

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

  1. Ignition off.
  2. Reconnect the connectors, reinstall components etc.
  3. Ignition on.
  4. Read off Intake Air Temperature (IAT) sensor signal. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor. Check that the signal is OK according to the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) .

Is the signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S22962877782011061000000)

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. Reconnect connectors, reinstall components
  3. Ignition on.
  4. Read off the intake air temperature (IAT). The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S15561234422011061000000)

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. Permanent fault

See Signal too high. Permanent fault

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).

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

  1. Ignition off.
  2. Reconnect the connectors, reinstall components etc.
  3. Ignition on.
  4. Read off Intake Air Temperature (IAT) sensor signal. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor. Check that the signal is OK according to the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) .

Is the signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S23743883322011061000000)

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.

Check intake air temperature (IAT) sensor connector for contact resistance and oxidation according to Contact resistance and oxidation and loose connections according to Loose connections (terminals) .

Check signal cable between control module #A5 (#A5) and intake air temperature (IAT) sensor connector #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

Check ground lead between control module #A60 (#A61) and intake air temperature (IAT) sensor connector #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-403956-S37247582692011061000000) .
  2. To access/replace the Intake Air Temperature (IAT) sensor see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-404035-S20199659872011061000000) .
  3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 286

Scheme 286
Scheme 286
  1. Continue Refer to «Information»(ref-404032-S22839154692011061000000)

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).

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).

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).

See Signal too low. Intermittent fault

See Signal too low. Intermittent fault

  1. Ignition off
  2. Check intake air temperature (IAT) sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  3. Reinstall components, reconnect connectors etc.
  4. Ignition on.
  5. Read off Intake Air Temperature (IAT) sensor signal. Check that the signal is within its permitted range. The voltage can vary between 0.17 V and 4.9 V depending on air temperature. At 20 °C (68 °F) voltage should be approximately 3.5 V. If signal is now OK this indicates that the fault was caused by poor contact in the connector. Other information To access/replace the Intake Air Temperature (IAT) sensor see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-404035-S20199659872011061000000) .

Is the signal OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking wiring and components»(ref-404032-S18275331872011061000000)

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

  1. Ignition off.
  2. Reconnect the connectors, reinstall components etc.
  3. Ignition on.
  4. Read off Intake Air Temperature (IAT) sensor signal. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor. Check that the signal is OK according to the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) .

Is the signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S21923543962011061000000)

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.

  1. Ignition off
  2. Check the intake air temperature (IAT) sensor connector. Check for contact resistance and oxidation
  3. Reinstall the components, reconnect the connectors etc.
  4. Ignition on
  5. Read off the signal from the intake air temperature (IAT) sensor. Check that the signal is within its permitted range. The voltage may vary between 0.17 V and 4.9 V depending on the air temperature. At 20 °C voltage should be approximately 3.5 V. If the signal is now OK, the fault was caused by poor contact in the connector. Other information To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000) See «Contents»(ref-438291-S00903409402011120100000) .

Is the signal OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking the wiring and component»(ref-404032-S27895231742011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components
  3. Ignition on.
  4. Read off the intake air temperature (IAT). The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.

Is the temperature within its permitted range?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S13408609652011061000000)

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 too low. Permanent fault

Checking the intake air temperature (IAT) sensor function

  1. Ignition on. Read off the outside temperature in Volt. Check that it is correct according to the table values: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) .

Is the temperature reading OK?

  1. YES Refer to «Faulty signal. Intermittent fault»(ref-404032-S07475996752011061000000)
  2. NO Refer to «Checking connector»(ref-404032-S39938139242011061000000)
  1. Ignition off.
  2. Check intake air temperature (IAT) sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) . Other information: To access the Mass Air Flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) . NOTE: The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.
  1. Continue Refer to «Checking intake air temperature (IAT) sensor»(ref-404032-S38646276532011061000000)

Checking intake air temperature (IAT) sensor

  1. Reinstall components, reconnect connectors etc.
  2. Ignition on. Read off the outside temperature in Volt. Check that it is correct according to the table values: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) . If the temperature is now OK it means that the fault was caused by loose connections in the connector. Other information: To access/replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) NOTE: The intake air temperature (IAT) sensor are integrated into the mass air flow (MAF) sensor and cannot be replaced separately.

Is the temperature reading OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking intake air temperature (IAT) sensor signal»(ref-404032-S08749915132011061000000)

Checking intake air temperature (IAT) sensor signal

Check intake air temperature (IAT) sensor voltage. For table values, see Intake air temperature (IAT) sensor inlet .

Remedy as necessary.

Other information

  1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
  2. To access the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
  3. To access/replace the Mass Air Flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000)
  4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .
  1. Continue Refer to «Verification»(ref-404032-S11088816272011061000000)

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components
  3. Ignition on. Read off the temperature in Volts Compare the measured value with the table value: «Intake air temperature (IAT) sensor inlet»(ref-403971-S26552703142011061000000) Other information: For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

Is the temperature reading OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO FAULT TRACING FAILED: 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.

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

Remedy as necessary.

Other information

  1. To access/replace the Mass Air Flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) .
  2. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
  3. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
  4. To access the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)

Note. The manifold absolute pressure (MAP) sensor is integrated into the mass air flow (MAF) sensor and cannot be replaced separately.

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

Check power supply cable between engine control module (ECM) #A58 (#A58) and mass air flow (MAF) sensor #3 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-403956-S37247582692011061000000) .
  2. To access/replace the Mass Air Flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000) .
  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 should be approximately 1 volt.
  4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 287

Scheme 287
Scheme 287
  1. Continue Refer to «Information»(ref-404032-S02106661622011061000000)

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).

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

Check power supply cable between engine control module (ECM) #A58 (#A58) and mass air flow (MAF) sensor #3 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-403956-S37247582692011061000000) .
  2. To access/replace the Mass Air Flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000) .
  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 should be approximately 1 volt.
  4. For information about signals on 5-cyl, see «Signal specification»(ref-438318-S23639998362011120100000) .
  5. For information about signals on 6-cyl, see «Signal specification»(ref-438318-S29219213252011120100000) .
  1. Continue Refer to «Information»(ref-404032-S39964699992011061000000)

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).

Flow too high. Intermittent fault

See Flow too high. Intermittent fault

See Flow too high. Intermittent fault

Checking cables

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

Check ground lead between #A58 (#A58) and mass air flow (MAF) sensor #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-403956-S37247582692011061000000) .
  2. To access/replace the Mass Air Flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000) .
  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 should be approximately 1 volt.
  4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .
  1. Continue Refer to «Verification»(ref-404032-S31707692062011061000000)

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

  1. Ignition off
  2. Reinstall the connectors, components etc.
  3. Ignition on
  4. Check that the air flow is correct. The value must be approximately 0 kg/h with the engine switched off
  5. Start the engine. Read off the air flow. The value may vary by between 12-20 kg/h at idle speed, depending on the engine load and temperature. The value may be in excess of 20 kg/h if the engine is cold
  6. Increase the engine speed (RPM) and check that the air flow increases with increased engine speed.

Are the values correct?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S09645316512011061000000)

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.

Check the cable between engine control module (ECM) #A22 (#A22) and mass air flow (MAF) sensor #5 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Check the ground lead between #A58 (#A58) and mass air flow (MAF) sensor #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-403956-S37247582692011061000000) .
  2. To access/replace the Mass Air Flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000) .
  3. With the ignition on and the mass air flow (MAF) sensor connector connected the voltage at mass air flow (MAF) sensor #2 should be approximately U batt , mass air flow (MAF) sensor #3 should be ground and mass air flow (MAF) sensor #5 should be approximately 1 V.
  4. For information about signals on 5-cylinder engines, see «Signal specification»(ref-438318-S23639998362011120100000) .
  5. For information about signals on 6-cylinder engines, see «Signal specification»(ref-438318-S29219213252011120100000) .
  1. Continue Refer to «Verification»(ref-404032-S07070090792011061000000)

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

  1. Ignition off
  2. Reinstall the connectors, components etc.
  3. Ignition on
  4. Check that the air flow is correct. The value must be approximately 0 kg/h with the engine switched off
  5. Start the engine. Read off the air flow. The value may vary by between 12-20 kg/h at idle speed, depending on the engine load and temperature. The value may be in excess of 20 kg/h if the engine is cold
  6. Increase the engine speed (RPM) and check that the air flow increases with increased engine speed.

Are the values correct?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S28867805072011061000000)

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.

Flow too high. Permanent fault

See Flow too high. Permanent fault

See Flow too high. Permanent fault

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).

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

  1. Ignition off
  2. Reinstall the connectors, components etc.
  3. Ignition on
  4. Check that the air flow is correct. The value must be approximately 0 kg/h with the engine switched off
  5. Start the engine. Read off the air flow. The value may vary by between 12-20 kg/h at idle speed, depending on the engine load and temperature. The value may be in excess of 20 kg/h if the engine is cold
  6. Increase the engine speed (RPM) and check that the air flow increases with increased engine speed.

Are the values correct?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S13472070172011061000000)

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.

Flow too low. Intermittent fault

See Flow too low. Intermittent fault

See Flow too low. Intermittent fault

  1. Ignition off
  2. Check mass air flow (MAF) sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) .
  3. Reinstall components, reconnect connectors etc.
  4. Ignition on.
  5. Check that the air flow corresponds, the value should be approximately 0 kg/h with engine switched off.
  6. Start the engine and read off the air flow which should be approximately 14 kg/h when idling.
  7. Increase the engine speed (RPM) and check that the air flow increases with increased engine speed. If the values correspond it means that the cause of the fault has been loose connections in the connector. Other information To access/replace the Mass Air Flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000) .

Is the function OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking component and wiring»(ref-404032-S09191619372011061000000)

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

  1. Ignition off
  2. Reinstall the connectors, components etc.
  3. Ignition on
  4. Check that the air flow is correct. The value must be approximately 0 kg/h with the engine switched off
  5. Start the engine. Read off the air flow. The value may vary by between 12-20 kg/h at idle speed, depending on the engine load and temperature. The value may be in excess of 20 kg/h if the engine is cold
  6. Increase the engine speed (RPM) and check that the air flow increases with increased engine speed.

Are the values correct?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S00858570322011061000000)

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.

Flow too low

See Flow too low

Flow too low. Permanent fault

See Flow too low. Permanent fault

See Flow too low. Permanent fault

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).

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Start the engine and let it idle.
  4. Read off the mass air flow (MAF) sensor signal. The mass air flow (MAF) sensor signal should be approximately 1.5-1.8 V at idling speed.

Is the mass air flow (MAF) sensor signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S18124035502011061000000)

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.

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).

  1. Ignition off
  2. Check the mass Air Flow (MAF) sensor connector for contact resistance and oxidation according to «Contact resistance and oxidation»(ref-403956-S41958999262011061000000) . Remedy as necessary. Other information: To access or replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) .
  1. Continue Refer to «Checking the connector»(ref-404032-S41775609282011061000000)
  1. Ignition off
  2. Reinstall the components, reconnect the connectors etc.
  3. Start the engine. Allow the engine to idle
  4. Read off the mass air flow (MAF) sensor signal. Check that the signal is within its permitted range. Voltage at idling speed must be 1.5-1.8 V. If the signal is now OK, the fault was caused by poor contact in the connector. Other information: To access and replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000) For mass air flow (MAF) sensor table values, see «Mass air flow (MAF) sensor»(ref-403971-S06501795622011061000000) .

Is the signal OK?

  1. YES Refer to «Verification»(ref-404032-S08879025282011061000000)
  2. NO Refer to «Checking the wiring and component»(ref-404032-S05299645302011061000000)

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).

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

  1. Ignition off.
  2. Reconnect connectors, reinstall components.
  3. Start the engine and let it idle.
  4. Read off the mass air flow (MAF) sensor signal. The mass air flow (MAF) sensor signal should be approximately 1.5-1.8 V at idling speed.

Is the mass air flow (MAF) sensor signal OK?

  1. YES VERIFIED: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S34592789932011061000000)

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.

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).

Checking components, intake system

Check using information about combined diagnostic trouble codes if this trouble code is a root problem or not. If the diagnostic trouble code is stored as lone diagnostic trouble code or if it is indicated as a root problem, continue with the troubleshooting below, otherwise follow troubleshooting for the diagnostic trouble code pointed out as root problem.

ECM-130A can be generated due to a damaged mass air flow sensor. An indication of this is that the engine control system has increased the fuel amount at partial load and then primarily the value for "Lambda adaptation, upper partial load". If any of the diagnostic trouble codes ECM-260A, ECM-261A, ECM-270A and/or ECM-271A with trouble type Upper limit is stored together with ECM-130A, troubleshoot according to any of these diagnostic trouble codes, otherwise continue according to the following.

Read off "Air mass, correction value" and check in which way the air adaptation has gone. A low value, less than approx. 0.85 indicates a clogged crankcase ventilation and/or dirty throttle module. A higher value, greater than approximately 1.15, indicates a (smaller) air leak somewhere in the intake system.

High value

Check the induction system for air leaks.

Check that the intake air temperature (IAT) sensor and boost pressure sensor are correctly installed. Check for air leakage around the components.

Note. Even extremely small air leaks can cause this diagnostic trouble code (DTC) to be stored.

Low value

For markets where upgraded software, released during year 2006 or later, is available, then if ECM-91A7 and/or ECM-91B7 is stored together with ECM-130A, then the throttle module shall be cleaned.

Otherwise, the solution to the diagnostic trouble code/symptom is to load the upgraded software in the vehicle.

For markets where upgraded software, released during year 2006 or later, is not available, the solution is to clean the throttle module and the crankcase ventilation.

See Identifying upgraded software ECM/ETM

Remedy as necessary.

Other information

  1. See «Information about combined diagnostic trouble codes (DTCs)»(ref-404036-S28837778002011061000000)
  2. See «Air leakage in the intake system, checking»(ref-404039-S19460685632011061000000)
  3. See «Throttle body (TB), cleaning»(ref-438325-S23458107292011120100000)
  4. See «Mass air flow (MAF) sensor, replacing»(ref-403955-S20239705332011061000000)
CAUTIONIn order for Electronic throttle module (ETM) to reset any reconfigurations as well as delete internally stored problems, the following must be performed: Turn off the ignition and then wait three minutes for the main relay or system relay to release the voltage feed to, among others, Electronic throttle module (ETM). Wait another three minutes, but if the electric cooling fan is running you have to wait another two minutes after the cooling fan has stopped, to ensure that Electronic throttle module (ETM) is shut off correctly. If this is not done correctly, diagnostic trouble codes may remain even after deleting diagnostic trouble codes and any reconfiguration may remain, despite the problem being fixed.
  1. Continue Refer to «Information»(ref-404032-S33102047102011061000000)

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.

  1. Ignition off.
  2. Check the mass air flow (MAF) sensor connector. Check for contact resistance and oxidation. Other information See «Information about combined diagnostic trouble codes (DTCs)»(ref-404036-S35367008622011061000000) See «Checking wiring and terminals»(ref-438291-S01987812252011120100000)
  1. Continue Refer to «Checking mass air flow (MAF) sensor signal»(ref-404032-S23021696482011061000000)

Checking mass air flow (MAF) sensor signal

  1. Start engine and run to normal operating temperature. Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters. Read off the air mass. Check that the air mass is within its various ranges at different engine speeds (RPM) according to «Mass air flow (MAF) sensor»(ref-403971-S06501795622011061000000) .

Are these values OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Checking component»(ref-404032-S23315723912011061000000)

Checking component

Check for air leakage in the intake system. Check in particular the hose between mass air flow (MAF) sensor and throttle body (TB) for leakage and damage according to Check for air leaks in the intake system .

Check the function of the crankcase ventilation. In particular, check for obstructions and deposits.

HINT: The flame trap may need separating and cleaning to achieve full flow in the system.

Remedy as necessary.

Other information

  1. See «Signal specification»(ref-403973-S19941283772011061000000)
  2. See «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000)
  1. Continue Refer to «Verification»(ref-404032-S36100663412011061000000)
  1. Start engine and run to normal operating temperature.
  2. Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
  3. Read off the air mass. Check that the air mass is within its various ranges at different engine speeds (RPM) according to «Mass air flow (MAF) sensor»(ref-403971-S06501795622011061000000) .

Are these values OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO Refer to «Information»(ref-404032-S12700737902011061000000)

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.

More articles — Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 4 of 14 (Convertible)