Engine Performance Diagnostic Trouble Code (DTC) Diagnostics - 5 of 14 (Convertible): Wiring Volvo C70 I

Checking wiring and components

Check reference voltage cable between control module connector #A58 (#A60) and mass air flow (MAF) connector terminal 3 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: With the ignition on and manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 3 and ground terminal should be approximately 5 V.

Check signal cable between control module #A23 (#A23) and manifold absolute pressure (MAP) sensor connector 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 manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 5 V.

Check ground lead between control module #A61 (#B3) and manifold absolute pressure (MAP) sensor connector terminal 2 for an open-circuit according to Open-circuit, permanent faults .

If wiring is OK, try a new manifold absolute pressure (MAP) sensor.

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. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
4. To localize the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000) .

Scheme 301

Scheme 302

1. Continue Refer to «Verification»(ref-404040-S06002839712011061000000)

Checking wiring and connectors

Check the reference voltage cable between control module connector terminal A58 (#A60) and manifold absolute pressure (MAP) sensor connector terminal 3 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

HINT: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5 V.

Check the signal cable between control module connector terminal A23 (#A23) and manifold absolute pressure (MAP) sensor connector terminal 1 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 .

HINT: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 1 and the ground terminal should be approximately 5 V.

Check the ground lead between control module connector terminal A61 (#B3) and manifold absolute pressure (MAP) sensor connector 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. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
4. To localize the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000) .

1. Continue Refer to «Information»(ref-404040-S10501153592011061000000)

Check the reference voltage cable between control module connector terminal A58 (#A60) and manifold absolute pressure (MAP) sensor connector terminal 3 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

HINT: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5 V.

Check the signal cable between control module connector terminal A23 (#A23) and manifold absolute pressure (MAP) sensor connector terminal 1 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 .

HINT: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 1 and the ground terminal should be approximately 5 V.

Check the ground lead between control module connector terminal A61 (#B3) and manifold absolute pressure (MAP) sensor connector 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. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
4. To localize the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000) .

1. Continue Refer to «Information»(ref-404040-S04418706972011061000000)

Check reference voltage cable between control module connector #A58 (#A60) and manifold absolute pressure (MAP) sensor connector terminal 3 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to ground according to Short-circuit to ground, permanent faults .

HINT: With the ignition on and manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 3 and ground terminal should be approximately 5 V.

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

HINT: With the ignition on and manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 5 V.

If wiring is OK, try a new manifold absolute pressure (MAP) sensor.

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. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
4. To localize the manifold absolute pressure (MAP) sensor, see «Location of components»(ref-403970-S02481495422011061000000) .

1. Continue Refer to «Verification»(ref-404040-S40930370202011061000000)

Check the boost pressure sensor connector. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable between control module terminal #A23 (#A23) and boost pressure sensor terminal 3. 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 boost pressure sensor 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 boost pressure 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-404040-S31839990072011061000000)

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

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

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access/replace the boost pressure sensor, see «Manifold absolute pressure (MAP) sensor, replacing»(ref-404035-S00760000652011061000000) .
3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 303

1. Continue Refer to «Verification»(ref-404040-S09309276612011061000000)

Checking components and wiring

Check the signal cable between control module terminal #A23 (#A23) and boost pressure sensor terminal 1. Check for an open-circuit. Check for a short-circuit to supply voltage.

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

Check the ground lead between control module terminal #A60 (#A60) and boost pressure 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 or replace the boost pressure 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 «Verification»(ref-404040-S41106054902011061000000)

Check the signal cable between control module terminal #A23 (#A23) and boost pressure sensor 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 boost pressure 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-404040-S14525940332011061000000)

Checking component and wiring

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

HINT: With the ignition on and boost pressure sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 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 boost pressure sensor, see «Manifold absolute pressure (MAP) sensor, replacing»(ref-404035-S00760000652011061000000) .
3. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

1. Continue Refer to «Verification»(ref-404040-S02804505392011061000000)

Check the signal cable between control module terminal #A23 (#A23) and boost pressure sensor terminal 1. Check for a short-circuit to ground.

HINT: With the ignition on and the boost pressure sensor connector disconnected the voltage between terminal 1 and ground terminal should 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 boost pressure 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 «Verification»(ref-404040-S20245409532011061000000)

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

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

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

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000)
3. For the resistance values, see «Component specifications»(ref-403971-S01187285952011061000000)
4. For information about signals see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 304

1. Continue Refer to «Information»(ref-404040-S05507514402011061000000)

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

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

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

Other information

1. To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000)
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000)
3. For information about signals see «Signal specification»(ref-438318-S23639998362011120100000)
4. For information about the resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) .

1. Continue Refer to «Information»(ref-404040-S19084529062011061000000)

Checking the wiring

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

1. Ignition off
2. Check the ground lead between control module terminal #A60 (#A60) and engine coolant temperature (ECT) sensor terminal #2. Check for an open-circuit. See «Open-circuit, permanent faults»(ref-403956-S01344180332011061000000)
3. Reinstall the components, reconnect the connectors etc. Other information To connect the breakout box and access the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) For the resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) For information about signals see «Signal specification»(ref-438318-S23639998362011120100000) .

Were any faults found in the ground cable?

1. YES Refer to «Verification»(ref-404040-S20758965172011061000000)
2. NO Refer to «Checking the engine coolant temperature (ECT)»(ref-404040-S17790748922011061000000)

Checking the wiring and component

Check the resistance of the engine coolant temperature (ECT) sensor. For the resistance values, see Engine coolant temperature (ECT) sensor .

Check the signal cable between control module connector terminal #A40 (#A40) and engine coolant temperature (ECT) sensor terminal 1. Check for an open-circuit. Check for a short-circuit to supply voltage.

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

Check the ground lead between control module connector terminal #A61 (#B3) and engine coolant temperature (ECT) sensor terminal 2. Check for an open-circuit.

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 control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
3. To access or replace the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Verification»(ref-404040-S01051388282011061000000)

Check the signal cable between control module terminal #A40 and terminal 1 on the connector for the engine coolant temperature (ECT) sensor. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.

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

Check the ground lead between control module terminal #A61 and terminal 2 on the connector for the engine coolant temperature (ECT) sensor. Check for an intermittent open-circuit.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
3. To access the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S04200298902011061000000)

Check the signal cable between control module terminal #A40 and terminal 1 on the connector for the engine coolant temperature (ECT) sensor. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.

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

Check the ground lead between control module terminal #A61 and terminal 2 on the connector for the engine coolant temperature (ECT) sensor. Check for an intermittent open-circuit.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
3. To access the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S32602372232011061000000)

Check engine coolant temperature (ECT) sensor resistance.

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
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-404040-S25216602772011061000000)

Check engine coolant temperature (ECT) sensor resistance.

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) .
4. For information about signals, see «Signal specification»(ref-438318-S23639998362011120100000) .

1. Continue Refer to «Verification»(ref-404040-S35808417462011061000000)

Check the resistance of the engine coolant temperature (ECT) sensor. For the resistance values, see Engine coolant temperature (ECT) sensor .

Check the signal cable between control module connector terminal #A40 (#A40) and engine coolant temperature (ECT) sensor terminal 1. Check for an short-circuit to ground. Check for an open-circuit.

Check the ground lead between control module connector terminal #A61 (#B3) and engine coolant temperature (ECT) sensor connector terminal 2. Check for an open-circuit.

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 engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
3. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000)
4. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Verification»(ref-404040-S08768647582011061000000)

Check the signal cable between control module terminal #A40 and engine coolant temperature (ECT) sensor terminal 2. Check for an intermittent short-circuit to ground.

Other information

1. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
2. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
3. To access or replace the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S10498535862011061000000)

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

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

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

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
3. For resistance values, see «Component specifications»(ref-403971-S01187285952011061000000) .
4. For information about signals, see «Signal specification»(ref-403971-S16906518782011061000000) .

Scheme 305

1. Continue Refer to «Information»(ref-404040-S01273000222011061000000)

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

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

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

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
3. For information about signals, see «Signal specification»(ref-438318-S23639998362011120100000) .
4. For information about the resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) .

1. Continue Refer to «Information»(ref-404040-S26034260042011061000000)

Check the signal cable between control module terminal #A40 and engine coolant temperature (ECT) sensor terminal 2. Check for an intermittent short-circuit to ground.

Other information

1. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
2. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
3. To access or replace the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S20893931822011061000000)

Check engine coolant temperature (ECT) sensor resistance.

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

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

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

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
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-404040-S23801226272011061000000)

Check engine coolant temperature (ECT) sensor resistance.

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

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

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

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Connecting the breakout box»(ref-403956-S37247582692011061000000) .
2. To access the engine coolant temperature (ECT) sensor, see «Engine temperature sensor»(ref-404026-S01967580252011061000000) .
3. For resistance values, see «Component specifications»(ref-403972-S40713314922011061000000) .
4. For information about signals, see «Signal specification»(ref-438318-S23639998362011120100000) .

1. Continue Refer to «Verification»(ref-404040-S21811321632011061000000)

Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation. Check for loose connections.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
3. To access the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S06509778462011061000000)

Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation. Check for loose connections.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access the control module, see «Engine control module (ECM), replacing»(ref-404026-S05981562602011061000000)
3. To access the engine coolant temperature (ECT) sensor, see «Engine coolant temperature (ECT) sensor, replacing»(ref-404026-S29654956492011061000000)
4. For information about signals see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S27019174252011061000000)

Check signal cable (+) between control module #A42 (#A42) and heated oxygen sensor (HO2S) connector terminal 4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: With the ignition on and heated oxygen sensor (HO2S) connector disconnected, the voltage between terminal 4 and ground terminal should be approximately 0.1 V.

Check signal cable (-) between control module #A41 (#A41) and heated oxygen sensor (HO2S) connector terminal 3 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

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

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

Scheme 306

1. Continue Refer to «Verification»(ref-404040-S35528095172011061000000)

Check signal cable (+) between control module #A42 (#A42) and heated oxygen sensor (HO2S) connector terminal #4 for an open-circuit according to Open-circuit, permanent faults and for a short-circuit to ground according to Short-circuit to ground, permanent faults .

HINT: With the ignition on and heated oxygen sensor (HO2S) connector disconnected, the voltage between terminal #4 and ground terminal should be approximately 0.1 V.

Check signal cable (-) between control module #A41 (#A41) and heated oxygen sensor (HO2S) connector terminal 3 for an open-circuit according to Open-circuit, permanent faults and for a short-circuit to ground according to Short-circuit to ground, permanent faults .

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

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 heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404040-S24398406392011061000000)

Check signal cable (+) between control module #A42 and heated oxygen sensor (HO2S) connector terminal 4 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Check signal cable (-) between control module #A41 and heated oxygen sensor (HO2S) connector terminal 3 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
2. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)

1. Continue Refer to «Information»(ref-404040-S19474408752011061000000)

Check signal cable (+) between control module #A42 and heated oxygen sensor (HO2S) connector terminal 4 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Check signal cable (-) between control module #A41 and heated oxygen sensor (HO2S) connector terminal 3 for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Other information

1. Connecting the breakout box/accessing the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
2. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)

1. Continue Refer to «Information»(ref-404040-S12769018292011061000000)

Checking the wiring and connectors

Check the cable between control module #A18 and heated oxygen sensor #2 for intermittent short-circuit to voltage.

Other information

1. See «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. See «Checking wiring and terminals. Intermittent faults»(ref-403956-S25853903222011061000000)
3. See «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. See «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)

1. Continue Refer to «Information»(ref-404040-S07292065982011061000000)

Check the resistance for the front heated oxygen sensor's coil between #1 and #2. At 20 °C the resistance should be approx. 1.0 ohms.

Check the cable between control module #A18 and front heated oxygen sensor #2 for short-circuit to voltage.

Remedy as necessary.

Other information

1. See «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. See «Checking wiring and terminals. Permanent fault»(ref-403956-S17348926582011061000000)
3. See «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. See «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)

1. Continue Refer to «Verification»(ref-404040-S09912710392011061000000)

Check cable between control module #A69 and front heated oxygen sensor (HO2S) #1 for an intermittent open-circuit according to Short-circuit to ground, intermittent faults .

Check cable between control module #A18 and front heated oxygen sensor (HO2S) #2 for an intermittent open-circuit according to Short-circuit to ground, intermittent faults .

Check the cable between control module #A36 and ground for an intermittent open-circuit 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 access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Information»(ref-404040-S03845415772011061000000)

Check the resistance of the front heated oxygen sensor (HO2S) element between #1 and #2. Resistance should be approximately 1.0 at 20 °C (68 °F).

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault .

Check the cable between control module #A18 and front heated oxygen sensor (HO2S) #2 for a short-circuit to ground according to Short-circuit to ground, permanent faults , and for an open-circuit according to Open-circuit, permanent faults .

Check the cable between control module #A69 and front heated oxygen sensor (HO2S) #1 for an open-circuit according to Open-circuit, permanent faults .

Check the cable between control module #A36 and ground 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 the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
3. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404040-S10438172822011061000000)

Check signal cable (+) between control module #A42 and heated oxygen sensor (HO2S) connector terminal #4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults , and a short-circuit to ground according to Short-circuit to ground, permanent faults .

Check signal cable (-) between control module #A41 and heated oxygen sensor (HO2S) connector terminal 3 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults , and a short-circuit to ground according to Short-circuit to ground, permanent faults .

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

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)

1. Continue Refer to «Verification»(ref-404040-S10420742502011061000000)

Check signal cable (+) between control module #A42 and heated oxygen sensor (HO2S) connector terminal 4 for an open-circuit according to Open-circuit, permanent faults .

HINT: With the ignition on and heated oxygen sensor (HO2S) connector disconnected, the voltage between terminal 4 and ground terminal should be approximately 3.8 V.

Check signal cable (-) between control module #A41 and heated oxygen sensor (HO2S) connector terminal 3 for an open-circuit according to Open-circuit, permanent faults .

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

Remedy as necessary.

Other information

1. Connecting the breakout box/accessing the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
2. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404040-S34302340602011061000000)

Checking wiring and component

Check the signal cable between control module terminal #A24 and heated oxygen sensor (HO2S) connector terminal 4. Check for a short-circuit to supply voltage.

Check the signal cable between control module terminal #A61 and heated oxygen sensor (HO2S) connector terminal 3. Check for a short-circuit to supply voltage.

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

Remedy as necessary.

Other information

1. To connect the breakout box, 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 or replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

Scheme 307

1. Continue Refer to «Verification»(ref-404040-S35027094112011061000000)

Checking wiring

Check the signal cable between control module terminal #A24 and heated oxygen sensor (HO2S) connector terminal #4. Check for an intermittent short-circuit to supply voltage.

Check the signal cable (-) between control module terminal #A61 and heated oxygen sensor (HO2S) terminal #3. Check for an intermittent short-circuit to supply voltage.

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 or replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Checking wiring and terminals»(ref-438291-S01987812252011120100000) .

1. Continue Refer to «Information»(ref-404040-S13092855302011061000000)

Check the signal cable between control module terminal A24 and heated oxygen sensor (HO2S) connector terminal 4 for an open-circuit to according to Open-circuit, permanent faults . Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Check the signal cable between control module terminal A61 and heated oxygen sensor (HO2S) connector terminal 3 for an open-circuit according to Open-circuit, permanent faults . Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

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

Remedy as necessary.

Other information

1. To connect the breakout box, 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 heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404040-S42607152642011061000000)

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

Check the signal cable between control module terminal A24 and heated oxygen sensor (HO2S) connector terminal 4 for an intermittent open-circuit to according to Open-circuit, intermittent faults . Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check the signal cable (-) between control module terminal A61 and heated oxygen sensor (HO2S) connector terminal 3 for an intermittent open-circuit to according to Open-circuit, intermittent faults . Check 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 access / replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Information»(ref-404040-S03808897762011061000000)

Check the cable between control module #A11 and heated oxygen sensor #2 for intermittent short-circuit to voltage.

Other information

1. See «Connecting the breakout box»(ref-403956-S00897666572011061000000)
2. See «Checking wiring and terminals. Intermittent faults»(ref-403956-S25853903222011061000000)
3. See «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. See «Signal specification»(ref-403973-S19941283772011061000000)
5. See «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)

1. Continue Refer to «Information»(ref-404040-S00945802122011061000000)

Check the resistance for the rear heated oxygen sensor's coil between #1 and #2. At 20 °C the resistance should be approx. 5.0-6.8 ohms.

Check the cable between control module terminal #A11 and front heated oxygen sensor #2 for short-circuit to voltage.

Remedy as necessary.

Other information

1. See «Checking wiring and terminals. Permanent fault»(ref-403956-S17348926582011061000000)
2. See «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
3. See «Signal specification»(ref-403973-S19941283772011061000000)
4. See «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)

1. Continue Refer to «Verification»(ref-404040-S35318556082011061000000)

Check cable between control module #A11 and rear heated oxygen sensor (HO2S) #2 for an intermittent open-circuit 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 access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Information»(ref-404040-S01743013352011061000000)

Check the resistance of the rear heated oxygen sensor (HO2S) element between #1 and #2. Resistance should be approximately 5.0 - 6.8 ohms at 20 °C (68 °F).

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault .

Check the cable between control module #A11 and rear heated oxygen sensor (HO2S) #2 for a short-circuit to ground according to Short-circuit to ground, permanent faults , and for an open-circuit according to Open-circuit, permanent faults .

Check cable between rear heated oxygen sensor (HO2S) #1 and fuse 2 in the R/S box 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 the control module, see «Replacing the engine control module (ECM)»(ref-404033-S34042663912011061000000)
3. To access/replace the heated oxygen sensor (HO2S), see «Heated oxygen sensor (HO2S), replacing»(ref-404033-S34986958782011061000000)
4. For information about signals, see «Signal specification»(ref-403973-S19941283772011061000000) .

1. Continue Refer to «Verification»(ref-404040-S19733448792011061000000)