Engine Control Module (ECM) Diagnostic Trouble Codes - 5 of 13: Wiring Volvo XC90 I

CHECKING COMPONENTS AND WIRING

Check the cable that relates to the diagnostic trouble code (DTC). Check for a short-circuit to supply voltage.

Check between

1. Engine control module (ECM) terminal #A50 (#A50) and ignition coil terminal #2 (ECM-360C, ignition coil 1)
2. Engine control module (ECM) terminal #A51 (#A51) and ignition coil terminal #2 (ECM-361C, ignition coil 2)
3. Engine control module (ECM) terminal #A30 (#A30) and ignition coil terminal #2 (ECM-362C, ignition coil 3)
4. Engine control module (ECM) terminal #A49 (#A49) and ignition coil terminal #2 (ECM-363C, ignition coil 4)
5. Engine control module (ECM) terminal #A31 (#A31) and ignition coil terminal #2 (ECM-364C, ignition coil 5)
6. Engine control module (ECM) terminal #A52 (#A52) and ignition coil terminal #2 (ECM-365C, ignition coil 6).

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
3. see «REPLACING IGNITION COIL»(ref-476695-S09217829992012060500000)
4. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S42457120082012060500000)

1. Check the connector for the ignition coil. Check for contact resistance. Check for oxidation. Check the cable that relates to the diagnostic trouble code (DTC). Check for a short-circuit to ground. Check between: Engine control module (ECM) terminal #A50 (#A50) and ignition coil terminal #2 (ECM-360D, ignition coil 1) Engine control module (ECM) terminal #A51 (#A51) and ignition coil terminal #2 (ECM-361D, ignition coil 2) Engine control module (ECM) terminal #A30 (#A30) and ignition coil terminal #2 (ECM-362D, ignition coil 3) Engine control module (ECM) terminal #A49 (#A49) and ignition coil terminal #2 (ECM-363D, ignition coil 4) Engine control module (ECM) terminal #A31 (#A31) and ignition coil terminal #2 (ECM-364D, ignition coil 5) Engine control module (ECM) terminal #A52 (#A52) and ignition coil terminal #2 (ECM-355D, ignition coil 6). Remedy as necessary. Other information see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) . see «REPLACING IGNITION COIL»(ref-476695-S09217829992012060500000) see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S09570166602012060500000)

CHECKING WIRING AND CONNECTORS

Check the evaporative emission system (EVAP) valve connector. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. Check the power supply between system relay terminal 3 and evaporative emission system (EVAP) valve terminal 1. Check for an intermittent open-circuit.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For 5 cylinder engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

Scheme 195

Scheme 196

1. Continue Refer to «INFORMATION»(ref-476765-S38028116212012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. Check the power supply between system relay terminal 3 and evaporative emission system (EVAP) valve terminal 1. 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-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S37540770482012060500000)

CHECKING THE WIRING

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. Check for an intermittent short-circuit to supply voltage.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

Scheme 197

1. Continue Refer to «INFORMATION»(ref-476765-S19972618312012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. Check for a short-circuit to supply voltage.

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

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
5. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
6. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
7. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S24658681472012060500000)

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. 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-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «INFORMATION»(ref-476765-S21762980622012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between control module terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal 2. Check for a short-circuit to ground.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For the location of components on 5 cylinder engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
3. For the location of components on 6 cylinder turbocharged engines, see «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S18127704342012060500000)

CHECKING THE COMPONENTS AND WIRING

Check the intake system for air leakage.

Check the exhaust system for air leakage.

Checking fuel and residual pressure.

Check the compression of the engine.

Remedy as necessary.

Note. Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Other information

1. see «INTAKE AND EXHAUST SYSTEM - CLEANING, INSPECTION AND ADJUSTMENT»(ref-476750)
2. see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
3. see «CHECKING FUEL AND RESIDUAL PRESSURES»(ref-494826-S19525701392012081600000)
4. see «CYLINDER LEAKAGE TEST»(ref-476762-S05706523772012060500000)
5. For B5xx4T, see «THREE-WAY CATALYTIC CONVERTER (TWC), REPLACING»(ref-476768-S17876452502012060500000)
6. For B6xx4T, see «THREE-WAY CATALYTIC CONVERTER (TWC), REPLACING»(ref-476768-S10252284712012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S24601316562012060500000)

Check the fuse before the circuit.

Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.

Check the resistance of the valve between the leak diagnostic pump connector terminals #3 and #4 (leak diagnostic unit side).

Check the signal cable between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for an open-circuit.

Check the power supply cable between system relay terminal #5 and leak diagnostic unit terminal #4. Check for an open-circuit.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)

Scheme 198

1. Continue Refer to «VERIFICATION»(ref-476765-S08228911212012060500000)

Check the resistance of the valve between the leak diagnostic unit connector terminals #3 and #4 (leak diagnostic pump side).

Check the signal cable between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for a short-circuit to supply voltage.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S42170729372012060500000)

Check the signal cable for the valve between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for a short-circuit to ground.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S06477843752012060500000)

Check the intake system for air leakage.

Check the exhaust system for air leakage.

Checking fuel and residual pressure.

Check the compression of the engine.

Remedy as necessary.

Note. Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Other information

1. see «INTAKE AND EXHAUST SYSTEM - CLEANING, INSPECTION AND ADJUSTMENT»(ref-476750)
2. see «CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM»(ref-494824-S07275287112012081600000)
3. see «CHECKING FUEL AND RESIDUAL PRESSURES»(ref-494826-S19525701392012081600000)
4. see «CYLINDER LEAKAGE TEST»(ref-476762-S05706523772012060500000)
5. For B5xx4T, see «THREE-WAY CATALYTIC CONVERTER (TWC), REPLACING»(ref-476768-S17876452502012060500000)
6. For B6xx4T, see «THREE-WAY CATALYTIC CONVERTER (TWC), REPLACING»(ref-476768-S10252284712012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S20908836052012060500000)

Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.

Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic pump side).

Check the signal cable between engine control module (ECM) terminal #B7 (#B17) and leak diagnostic pump terminal #1. Check for an open-circuit.

Check the power supply cable between system relay terminal #5 and leak diagnostic unit terminal #4. Check for an open-circuit.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000) .

1. Continue Refer to «INFORMATION»(ref-476765-S34331206732012060500000)

Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic pump side).

Check the signal cable between engine control module (ECM) terminal #B7 (#B17) and leak diagnostic unit terminal #1. Check for a short-circuit to supply voltage.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000) .

1. Continue Refer to «INFORMATION»(ref-476765-S11019476062012060500000)

Check the signal cable between engine control module (ECM) terminal #B7 (#B17) and leak diagnostic unit terminal #1. Check for a short-circuit to ground.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
3. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
6. To access or replace the leak diagnostic unit, see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000) .

1. Continue Refer to «INFORMATION»(ref-476765-S02336067342012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between engine control module (ECM) terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal #2. Check for an open-circuit.

Check the power supply between system relay terminal #3 and evaporative emission system (EVAP) valve terminal #1. Check for an open-circuit.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. For the location of components on 5 cylinder engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
5. For the location of components on 6 cylinder turbocharged engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S40298616992012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between engine control module (ECM) terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal #2. Check for a short-circuit to supply voltage.

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

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
5. For the location of components on 5 cylinder engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
6. For the location of components on 6 cylinder turbocharged engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
7. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S37957315362012060500000)

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between engine control module (ECM) terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal #2. Check for a short-circuit to ground.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. For the location of components on 5 cylinder engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
5. For the location of components on 6 cylinder turbocharged engines, see: «LOCATION OF COMPONENTS, ENGINE COMPARTMENT»(ref-476766-S14590560332012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S25188177882012060500000)

Check the cable between engine control module (ECM) terminal #B34 (#B44) and leak diagnostic unit terminal #2. Check for an open-circuit.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)
5. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «INFORMATION»(ref-476765-S04865793352012060500000)

Check the signal cable. Check for a short-circuit to supply voltage.

Take readings between

1. Engine control module (ECM) #B34 (#C44) and leakage diagnostic unit #2.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)
5. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «INFORMATION»(ref-476765-S35305271982012060500000)

Check the signal cable. Check for a short-circuit to ground. Take readings between

1. Engine control module (ECM) #B34 (#C44) and leakage diagnostic unit #2.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)
5. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «INFORMATION»(ref-476765-S34706276912012060500000)

Check the resistance of the valve between the leak diagnostic unit connector terminals #3 and #4 (leak diagnostic pump side).

Check the signal cable between engine control module (ECM) terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for a short-circuit to supply voltage.

Try a new leak diagnostic unit if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. For resistance values: «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000)
5. see «LEAK DIAGNOSTIC PUMP, REPLACING»(ref-476751-S30362075082012060500000)
6. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S35048083772012060500000)

CHECKING COMPONENT AND WIRING

Check if there is any refrigerant in the air conditioning (A/C).

HINT: If there is refrigerant in the A/C system there is probably a fault in the A/C pressure sensor.

Check air conditioning (A/C) system for damage and leakage.

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) .
2. Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5V) and #1 is the signal ground.
3. For resistance values, see «COMPONENT SPECIFICATIONS»(ref-476694-S25701556572012060500000) .
4. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
5. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)

Scheme 199

1. Continue Refer to «VERIFICATION»(ref-476765-S26294287022012060500000)

Check signal cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) sensor #2 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) #A39 (#A39) and air conditioning (A/C) pressure sensor #3 for an intermittent open-circuit according to OPEN-CIRCUIT, INTERMITTENT FAULTS

Check power supply cable between engine control module (ECM) #A60 (#A60) and air conditioning (A/C) pressure sensor #1 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-476691-S38062545372012060500000) .
2. Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5V) and #1 is the signal ground.
3. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
4. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)

1. Continue Refer to «INFORMATION»(ref-476765-S31957641232012060500000)

Check signal cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) pressure sensor #2 for a short-circuit to supply voltage according to SHORT-CIRCUIT TO SUPPLY VOLTAGE. PERMANENT FAULTS .

Check power supply cable between engine control module (ECM) #A39 (#A39) and air conditioning (A/C) pressure sensor #3 for an open-circuit according to OPEN-CIRCUIT, PERMANENT FAULTS .

Check power supply cable between engine control module (ECM) #A60 (#A60) and air conditioning (A/C) pressure sensor #1 for an open-circuit according to OPEN-CIRCUIT, PERMANENT FAULTS .

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000) .
2. Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5V) and #1 is the signal ground.
3. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
4. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S26914466722012060500000)

Check air conditioning (A/C) pressure sensor connector for intermittent contact resistance and oxidation according to CONTACT RESISTANCE AND OXIDATION

Check cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) sensor #2 for an intermittent short-circuit to ground according to SHORT-CIRCUIT TO GROUND, INTERMITTENT FAULTS

Check signal cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) pressure sensor #2 for an intermittent open circuit according to OPEN-CIRCUIT, INTERMITTENT FAULTS

Check power supply cable between engine control module (ECM) #A39 (#A39) and air conditioning (A/C) pressure sensor #3 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-476691-S38062545372012060500000) .
2. Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5V) and #1 is the signal ground.
3. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
4. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)

1. Continue Refer to «INFORMATION»(ref-476765-S04937759762012060500000)

Check air conditioning (A/C) pressure sensor connector for contact resistance and oxidation according to CONTACT RESISTANCE AND OXIDATION .

Check signal cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) pressure sensor #2 for an short-circuit to ground according to SHORT-CIRCUIT TO GROUND, PERMANENT FAULTS .

Check signal cable between engine control module (ECM) #A68 (#B8) and air conditioning (A/C) pressure sensor #2 for an open circuit according to OPEN-CIRCUIT, PERMANENT FAULTS .

Check power supply cable between engine control module (ECM) #A39 (#A39) and air conditioning (A/C) pressure 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-476691-S38062545372012060500000) .
2. Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5 V) and #1 is the signal ground.
3. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
4. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S01356955202012060500000)

Check the engine speed (RPM) sensor connector. Check for intermittent contact resistance and oxidation.

HINT: The engine speed (RPM) sensor and its wiring are sensitive to interference from surrounding cables, the starter motor cable for example, or similar high amperage cables.

Interference can cause difficulty in starting the engine, prevent the engine starting at all, or cause intermittent operation of the tachometer, etc.

Check whether any cables with high power consumption are incorrectly installed, i. e. too close to the engine speed (RPM) sensor or its wiring.

Remedy as necessary.

Other information

1. For B5xx4T, see «REPLACING THE ENGINE SPEED (RPM) SENSOR»(ref-476695-S39857541522012060500000)
2. For B6xx4T, see «ENGINE SPEED (RPM) SENSOR, REPLACING»(ref-476695-S14133553602012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S29188563502012060500000)

CHECKING THE COMPONENT AND WIRING

1. Check the engine speed (RPM) sensor connector. Check for intermittent contact resistance and oxidation. HINT: The engine speed (RPM) sensor and its wiring are sensitive to interference from surrounding cables, the starter motor cable for example, or similar high amperage cables. Interference can cause difficulty in starting the engine, prevent the engine starting at all, or cause intermittent operation of the tachometer, etc. Check whether any cables with high power consumption are incorrectly installed, i. e. too close to the engine speed (RPM) sensor or its wiring. Remedy as necessary Other information For B5xx4T, see «REPLACING THE ENGINE SPEED (RPM) SENSOR»(ref-476695-S39857541522012060500000) For B6xx4T, see «ENGINE SPEED (RPM) SENSOR, REPLACING»(ref-476695-S14133553602012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S32378267132012060500000)

CHECKING CONNECTORS AND WIRING

Check the oil level sensor connector. Check for loose connections, contact resistance and oxidation.

Check the signal cable between engine control module (ECM) terminal #A40 and oil level sensor terminal #1. Check for an open-circuit.

Check the cable between engine control module (ECM) terminal #A39 and oil level sensor terminal #3. Check for an open-circuit.

Check the cable between engine control module (ECM) terminal #A60 and oil level sensor terminal #2. Check for an open-circuit.

HINT: With the ignition on, the voltage between terminals #2 and #3 must be 5 V, with the reading taken at the oil level sensor connector.

Try a new oil level sensor if no fault is found and the fault is permanent.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «OIL LEVEL SENSOR, REPLACING»(ref-494730-S12099581232012081600000)
5. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)

1. Continue Refer to «VERIFICATION»(ref-476765-S40483448512012060500000)

Check the signal cable between engine control module (ECM) terminal #A40 and oil level sensor terminal #1. Check for a short-circuit to supply voltage.

HINT: With the ignition on, the voltage between terminals #2 and #3 must be 5 V, with the reading taken at the oil level sensor connector.

Try a new oil level sensor if no fault is found and the fault is permanent.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
3. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
4. To access or replace the oil level sensor, see «OIL LEVEL SENSOR, REPLACING»(ref-494730-S12099581232012081600000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S11842328192012060500000)

Check the signal cable between engine control module (ECM) terminal #A40 and oil level sensor terminal #1. Check for a short-circuit to ground.

HINT: With the ignition on, the voltage between terminals #2 and #3 must be 5 V, with the reading taken at the oil level sensor connector.

Try a new oil level sensor if no fault is found and the fault is permanent.

Remedy as necessary.

Other information

1. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000)
2. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
3. For 5 cylinder turbocharged engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S29505181092012060500000) .
4. To access or replace the oil level sensor, see «OIL LEVEL SENSOR, REPLACING»(ref-494730-S12099581232012081600000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S19427513322012060500000)

Check the connector for the air conditioning (A/C) relay. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable between control module terminal #B44 and air conditioning (A/C) relay terminal #4. Check the power supply between system relay terminal #3 and A/C relay 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-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
3. For 6 cylinder engines 2005-, see «SIGNAL SPECIFICATION»(ref-476694-S31890965202012060500000) .
4. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

Scheme 200

1. Continue Refer to «INFORMATION»(ref-476765-S35483320372012060500000)

Check the resistance of the air conditioning (A/C) relay. At +20°C the resistance must be approximately 96 ohms between terminals #2 and #4. For the resistance values, see COMPONENT SPECIFICATIONS .

Check the signal cable between control module terminal #B44 and air conditioning (A/C) relay terminal #4. Check the power supply between system relay terminal #3 and A/C relay terminal #2. Check for an open-circuit. Check for a short-circuit to ground.

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
3. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
4. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S16437820212012060500000)

Check the signal cable between control module terminal #B44 and air conditioning (A/C) relay terminal #4. Check for an intermittent short-circuit to supply voltage.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
3. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
4. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «INFORMATION»(ref-476765-S15182661392012060500000)

Check the signal cable between control module terminal #B44 and air conditioning (A/C) relay terminal #4. Check for a short-circuit to supply voltage.

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

Remedy as necessary.

Other information

1. To connect the breakout box / access the control module, see «CONNECTING THE BREAKOUT BOX»(ref-476691-S38062545372012060500000)
2. For 5 cylinder turbocharged engines -2004, see «SIGNAL DESCRIPTION»(ref-476694-S26303328522012060500000)
3. For 6 cylinder engines -2004, see «SIGNAL SPECIFICATION»(ref-476694-S39196199822012060500000)
4. see «CHECKING WIRING AND TERMINALS»(ref-476689-S17283010372012060500000) .

1. Continue Refer to «VERIFICATION»(ref-476765-S11217802042012060500000)