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

Checking components and wiring

Check the resistance of the outside temperature sensor.

Check the signal cable between control module terminal #B29 (#B39) and outside temperature sensor terminal #1. Check for a short-circuit to ground.

HINT: With the ignition on and the outside temperature sensor connector disconnected, the voltage between #1 and the ground terminal must be approximately 5 V.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access and replace the outside temperature sensor, see «Replacing sensor»(ref-403985-S15776512902011061000000)
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000)
4. For information about signals, see «Signal specification»(ref-438318-S23639998362011120100000)
5. See «Contents»(ref-438291-S00903409402011120100000)

Scheme 245

1. Continue Refer to «Verification»(ref-404032-S20900054252011061000000)

Checking wiring and components

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

Check signal cable between control module connector #B29 (#B41) and outside temperature sensor terminal 1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

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

Check the ground lead between control module #B4 (#B16) and outside temperature sensor terminal 2 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. See «Engine control module (ECM), replacing»(ref-404032-S32884251882011061000000)
3. To localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404032-S09958195172011061000000)

Checking wiring and connectors

Check the control module and outside temperature sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation , and loose connections according to Loose connections (terminals) .

Check the signal cable between control module connector #B29 (#B41) and outside temperature sensor terminal 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 the ground lead between control module #B4 (#B16) and outside temperature sensor terminal 2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

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

1. Continue Refer to «Information»(ref-404032-S22134084032011061000000)

Check the control module and outside temperature sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation , and loose connections according to Loose connections (terminals) .

Check the signal cable between control module connector #B29 (#B41) and outside temperature sensor terminal 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 the ground lead between control module #B4 (#B16) and outside temperature sensor terminal 2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

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

1. Continue Refer to «Information»(ref-404032-S39222474162011061000000)

Checking component and wiring

Check outside temperature sensor resistance.

Check signal cable between control module #B29 (#B39) and outside temperature sensor #1 for a short-circuit to ground according to Short-circuit to ground, permanent faults

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

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 outside temperature sensor, see «Outside temperature sensor»(ref-403985-S29568340922011061000000) .
3. For resistance values, see «Component specifications»(ref-403971-S01187285952011061000000) .
4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

1. Continue Refer to «Verification»(ref-404032-S02505785362011061000000)

Check the resistance of the outside temperature sensor.

Note. The outside temperature sensor may be defective if there was a short-circuit to supply voltage in the signal cable. Check this before replacing the sensor.

Check the signal cable between control module terminal #B29 (#B39) and outside temperature sensor terminal #1. Check for a short-circuit to supply voltage. Check for an open-circuit.

HINT: With the ignition on and the outside temperature sensor connector disconnected, the voltage between #1 and ground must be approximately 5 V.

Check the ground lead between control module terminal #B4 (#B14) and outside temperature sensor terminal #2. Check for an open-circuit.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access and replace the outside temperature sensor, see «Replacing sensor»(ref-403985-S15776512902011061000000)
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000)
4. For information about signals, see «Signal specification»(ref-438318-S23639998362011120100000)
5. See «Contents»(ref-438291-S00903409402011120100000) .

1. Continue Refer to «Verification»(ref-404032-S10412710242011061000000)

Check the resistance of the outside temperature sensor. Compare with table in link below.

Check the signal cable between control module connector #B29 (#B41) and outside temperature sensor terminal 1 for a short-circuit to ground according to Short-circuit to ground, permanent faults

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

Remedy as necessary.

Other information

1. See «Outer temperature sensor»(ref-438318-S05560076662011120100000)
2. See «Connecting the breakout box»(ref-403956-S00897666572011061000000)
3. See «Location of components»(ref-403970-S02481495422011061000000)
4. See «Signal specification»(ref-403973-S19941283772011061000000)

1. Continue Refer to «Verification»(ref-404032-S10124896512011061000000)

Check the signal cable between control module #B29 (#B41) and outside temperature sensor terminal 1 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

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 localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Information»(ref-404032-S05550705182011061000000)

Check the signal cable between control module #B29 (#B41) and outside temperature sensor terminal 1 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

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 localize the outside temperature sensor, see «Location of components»(ref-403970-S02481495422011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Information»(ref-404032-S38144004672011061000000)

Check outside temperature sensor resistance.

Note. The outside temperature sensor can be defective if the signal cable has been short-circuited to supply voltage. Check this before replacing the sensor.

Check signal cable between control module #B29 (#B39) and outside temperature sensor #1 for an intermittent open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

HINT: With the ignition on and the outside temperature sensor connector disconnected, the voltage between #1 and ground should be approximately 5 V.

Check the ground lead between control module #B2 (#B12) and the outside temperature sensor #2 for an open-circuit according to Open-circuit, permanent faults

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access/replace the outside temperature sensor see «Outside temperature sensor»(ref-403985-S29568340922011061000000) .
3. For resistance values, see «Component specifications»(ref-403971-S01187285952011061000000) .
4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

1. Continue Refer to «Verification»(ref-404032-S02304229752011061000000)

Check the intake air temperature (IAT) sensor voltage between terminals 3 and 4 on the mass air flow (MAF) sensor. The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor. For voltage values, see Intake air temperature (IAT) sensor inlet .

Check the signal cable between control module connector terminal A4 (#A4) and mass air flow (MAF) sensor connector terminal 3 for an open-circuit according to Open-circuit, permanent faults . Also check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: With the ignition on and the mass air flow (MAF) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5 V.

Check the ground lead between control module connector terminal A61 (#B3) and mass air flow (MAF) sensor connector terminal 4 for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access / replace 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) .

Scheme 246

1. Continue Refer to «Verification»(ref-404032-S25375198842011061000000)

Check the control module and mass air flow (MAF) sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation . Also check for loose connections according to Loose connections (terminals) . The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor.

Check the signal cable between control module connector terminal A4 (#A4) and mass air flow (MAF) sensor connector terminal 3 for an intermittent open-circuit according to Open-circuit, intermittent faults . Also check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Check the ground lead between control module connector terminal A61 (#B3) and mass air flow (MAF) sensor connector terminal 4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access / replace 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 «Information»(ref-404032-S20942145022011061000000)

Check the signal cable between control module terminal #A5 (#A5) and intake air temperature (IAT) sensor connector terminal #1. Check for an intermittent short-circuit to ground.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000)
3. For information about signals on 5 cylinder engines, see «Signal specification»(ref-438318-S23639998362011120100000)
4. For information about signals on 6 cylinder engines, see «Signal specification»(ref-438318-S29219213252011120100000)
5. See «Contents»(ref-438291-S00903409402011120100000) .

1. Continue Refer to «Information»(ref-404032-S24182693602011061000000)

Check the control module and mass air flow (MAF) sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation . Also check for loose connections according to Loose connections (terminals) . The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor.

Check the signal cable between control module connector terminal A4 (#A4) and mass air flow (MAF) sensor connector terminal 3 for an intermittent open-circuit according to Open-circuit, intermittent faults . Also check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Check the ground lead between control module connector terminal A61 (#B3) and mass air flow (MAF) sensor connector terminal 4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access / replace 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 «Information»(ref-404032-S28990453532011061000000)

Check the Intake Air Temperature (IAT) sensor resistance.

Check signal cable between control module #A5 (#A5) and intake air temperature sensor #1 for a short-circuit to ground according to Short-circuit to ground, permanent faults

HINT: With the ignition on and the Intake Air Temperature (IAT) sensor connector disconnected, the voltage between #1 and ground should be approximately 5 V.

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 Intake Air Temperature (IAT) sensor see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-404035-S20199659872011061000000) .
3. For resistance values, see «Component specifications»(ref-403971-S01187285952011061000000) .
4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

1. Continue Refer to «Verification»(ref-404032-S01335786492011061000000)

Checking the wiring and component

Check the Intake Air Temperature (IAT) sensor resistance.

Check the signal cable between control module terminal #A5 (#A5) and intake air temperature sensor terminal #1. Check for a short-circuit to ground.

HINT: With the ignition on and the intake air temperature (IAT) sensor connector disconnected, the voltage between terminal #1 and ground must be approximately 5 V.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000)
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000)
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)
6. See «Contents»(ref-438291-S00903409402011120100000) .

1. Continue Refer to «Verification»(ref-404032-S09056186032011061000000)

Check the signal cable between control module connector terminal A4 (#A4) and manifold absolute pressure (MAP) sensor connector terminal 3 for a short-circuit to ground according to Short-circuit to ground, permanent faults .

HINT: With the ignition on and the mass air flow (MAF) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5 V.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access / replace 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-S41805496562011061000000)

Check signal cable between control module #A22 (#A22) and mass air flow (MAF) sensor terminal 3 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.

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 «Information»(ref-404032-S09117045432011061000000)

Check the intake air temperature (IAT) sensor connector. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable between control module terminal #A5 (#A5) and intake air temperature (IAT) sensor connector terminal #1. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.

Check the ground lead between control module terminal #A60 (#A60) and intake air temperature (IAT) sensor connector terminal #2. Check for an intermittent open-circuit.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000)
3. For information about signals on 5 cylinder engines, see «Signal specification»(ref-438318-S23639998362011120100000)
4. For information about signals on 6 cylinder engines, see «Signal specification»(ref-438318-S29219213252011120100000)
5. See «Contents»(ref-438291-S00903409402011120100000) .

1. Continue Refer to «Information»(ref-404032-S23506751432011061000000)

Check signal cable between control module #A22 (#A22) and mass air flow (MAF) sensor terminal 3 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.

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 «Information»(ref-404032-S08990189702011061000000)

Check the Intake Air Temperature (IAT) sensor resistance.

Note. The Intake Air Temperature (IAT) sensor can be defective if the signal cable has been short-circuited to supply voltage. Check this before replacing the sensor.

Check signal cable between control module #A5 (#A5) and intake air temperature (IAT) sensor connector #1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

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

Check the ground lead between control module #A60 (#A60) and intake air temperature (IAT) sensor connector #2 for an open-circuit according to Open-circuit, permanent faults

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-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) .

1. Continue Refer to «Verification»(ref-404032-S39967524162011061000000)

Check the Intake Air Temperature (IAT) sensor resistance.

Note. The intake air temperature (IAT) sensor may be defective if there gas been a short-circuit to supply voltage in the signal cable. Check this before replacing the sensor.

Check the signal cable between control module terminal #A5 (#A5) and intake air temperature (IAT) sensor connector terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.

HINT: With the ignition on and the intake air temperature (IAT) sensor connector disconnected, the voltage between terminal #1 and ground must be approximately 5 V.

Check the ground lead between control module terminal #A60 (#A60) and intake air temperature (IAT) sensor connector terminal #2. Check for an open-circuit.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access or replace the intake air temperature (IAT) sensor, see «Temperature and pressure sensor, replacing»(ref-438319-S03698622212011120100000)
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000)
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)
6. See «Contents»(ref-438291-S00903409402011120100000) .

1. Continue Refer to «Verification»(ref-404032-S17552225742011061000000)

Checking the component, wiring and connector

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

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

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

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

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

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

Remedy as necessary

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-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, signal cable, should be approximately 1 volt.
4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

1. Continue Refer to «Information»(ref-404032-S02459994412011061000000)

Check the mass air flow (MAF) sensor connector. Check for contact resistance and oxidation.

Check for air leakage in the intake system and for damage to hoses etc.

Check the inside of the throttle body (TB). Check for contamination. When the throttle body (TB) is contaminated, the air flow to the engine is impaired and diagnostic trouble code (DTCs) or fault symptoms can occur.

Clean the throttle body (TB) if needed.

Check the power supply cable between system relay terminal #5 and mass air flow (MAF) sensor terminal #2. Check for an open-circuit.

Check the signal cable between engine control module (ECM) terminal #A22 (#A22) and mass air flow (MAF) sensor terminal #5. Check for a short-circuit to ground.

Check the power supply cable between engine control module (ECM) terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for an open-circuit.

HINT: With the ignition on and the mass air flow (MAF) sensor connector connected the voltage at mass air flow (MAF) sensor terminal #2 must be approximately U bat.

Remedy as necessary.

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. See «Checking for air leakage in the intake system»(ref-404038-S32853344482011061000000)
3. See «Throttle body (TB), cleaning»(ref-438325-S23458107292011120100000)
4. See «Mass air flow sensor (MAF), replacing»(ref-403955-S38455306752011061000000)
5. For information about signals on 5 cylinder engines, see «Signal specification»(ref-438318-S23639998362011120100000)
6. For information about signals on 6 cylinder engines, see «Signal specification»(ref-438318-S29219213252011120100000)
7. See «Contents»(ref-438291-S00903409402011120100000)

1. Continue Refer to «Verification»(ref-404032-S31188553342011061000000)

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

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

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

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

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-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-S12098429172011061000000)

Check mass air flow (MAF) sensor resistance. For actual voltage levels see Mass air flow (MAF) sensor .

Check signal cable between control module #A22 (#A22) and mass air flow (MAF) sensor terminal 2 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access/replace 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-S25232204012011061000000)

Check signal cable between control module #A22 (#A22) and mass air flow (MAF) sensor terminal 2 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

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 «Information»(ref-404032-S13044781062011061000000)

Check signal cable between control module #A22 (#A22) and mass air flow (MAF) sensor terminal 2 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

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 «Information»(ref-404032-S38853761822011061000000)

Check the signal from the mass air flow (MAF) sensor. For actual voltage levels, see Mass air flow (MAF) sensor .

Check the signal cable between control module terminal #A22 (#A22) and mass air flow (MAF) sensor terminal 2. Check for a short-circuit to ground. See Short-circuit to ground, permanent faults . Check for an open-circuit. See Open-circuit, permanent faults .

Check the ground lead between control module connector terminal #A60 (#B2) and mass air flow (MAF) sensor connector terminal 5. Check for an open-circuit. See Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access or replace the mass air flow (MAF) sensor, see «Replacing the mass air flow (MAF) sensor»(ref-438318-S20858943492011120100000)
3. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404032-S08879025282011061000000)

Check control module and mass air flow (MAF) sensor connectors 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 #A22 (#A22) and mass air flow (MAF) sensor terminal 2 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults , and an intermittent open-circuit according to Open-circuit, intermittent faults .

Check ground lead between control module connector #A60 (#B2) and mass air flow (MAF) sensor connector terminal 5 for an intermittent open-circuit according to Open-circuit, intermittent faults .

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 «Information»(ref-404032-S08582649462011061000000)

Check control module and mass air flow (MAF) sensor connectors 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 #A22 (#A22) and mass air flow (MAF) sensor terminal 2 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults , and an intermittent open-circuit according to Open-circuit, intermittent faults .

Check ground lead between control module connector #A60 (#B2) and mass air flow (MAF) sensor connector terminal 5 for an intermittent open-circuit according to Open-circuit, intermittent faults .

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 «Information»(ref-404032-S04048528422011061000000)