( TF09E4DA20326926935FAAT00 )

F-CAN Circuit Troubleshooting

NOTE: Information marked with an asterisk ( ^* ) applies to the CANL line.

Turn the ignition switch to LOCK (0).

Jump the SCS line with the HDS.

Disconnect ECM/PCM connector A (49P), then disconnect the HDS.

Measure the resistance between ECM/PCM connector terminals A3 and A4.

Is there about 95−116 Ω?

YES	-	Go to Step 27 .
NO	-	Go to Step 5 .

Disconnect these connectors:

Check for continuity between ECM/PCM connector terminals A3 and A4.

Is there continuity?

YES	-	Repair short in the wire between ECM/PCM terminals A3 and A4 ^* .■
NO	-	Go to Step 7 .

Connect ECM/PCM connector terminal A3 to body ground with a jumper wire.

Check for continuity between gauge control module 32P connector terminal No. 30 and body ground.

Is there continuity?

YES	-	With ABS: Go to Step 9 . Without ABS: Go to Step 10 .
NO	-	Repair open in the wire between the ECM/PCM (A3) and the gauge control module.■

Check for continuity between ABS modulator-control unit 25P connector terminal No. 1 and body ground.

Is there continuity?

YES	-	Go to Step 10 .
NO	-	Repair open in the wire between the ECM/PCM (A3) and the ABS modulator-control unit.■

Check for continuity between EPS control unit connector C (16P) terminal No. 10 and body ground.

Is there continuity?

YES	-	Go to Step 11 .
NO	-	Repair open in the wire between the ECM/PCM (A3) and the EPS control unit.■

Remove the jumper wire from ECM/PCM connector A (49P).

Connect ECM/PCM connector terminal A4 to body ground with a jumper wire.

Check for continuity between gauge control module 32P connector terminal No. 29 and body ground.

Is there continuity?

YES	-	With ABS: Go to Step 14 . Without ABS: Go to Step 15 .
NO	-	Repair open in the wire between the ECM/PCM (A4) and the gauge control module.■

Check for continuity between ABS modulator-control unit 25P connector terminal No. 17 and body ground.

Is there continuity?

YES	-	Go to Step 15 .
NO	-	Repair open in the wire between the ECM/PCM (A4) and the ABS modulator-control unit.■

Check for continuity between EPS control unit connector C (16P) terminal No. 9 and body ground.

Is there continuity?

YES	-	Go to Step 16 .
NO	-	Repair open in the wire between the ECM/PCM (A4) and the EPS control unit.■

Reconnect the gauge control module 32P connector.

Measure the resistance between ECM/PCM connector terminals A3 and A4.

Is there about 108−132 Ω?

YES	-	With ABS: Go to Step 18 . Without ABS: Go to Step 21 .
NO	-	Substitute a known-good gauge control module, If the HDS identifies the vehicle, replace the original gauge control module. ■

Disconnect the gauge control module 32P connector.

Reconnect the ABS modulator-control unit 25P connector.

Measure the resistance between ECM/PCM connector terminals A3 and A4.

Is there about 2.34−2.86 kΩ?

YES	-	Go to Step 21 .
NO	-	Substitute a known-good ABS modulator-control unit, If the HDS identifies the vehicle, replace the original ABS modulator-control unit. ■

Disconnect the ABS modulator-control unit 46P connector (with ABS) or the gauge control module 32P connector (without ABS).

Reconnect EPS control unit connector C (16P).

Measure the resistance between ECM/PCM connector terminals A3 and A4.

Is there about 2.34−2.86 kΩ?

YES	-	Go to Step 24 .
NO	-	Substitute a known-good EPS control unit, If the HDS identifies the vehicle, replace the original EPS control unit. ■

Disconnect EPS control unit connector C (16P).

Reconnect SRS unit connector A (39P).

Measure the resistance between ECM/PCM connector terminals A3 and A4.

Is there about 2.34−2.86 kΩ?

YES	-	Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
NO	-	Substitute a known-good SRS unit. If the HDS identifies the vehicle, replace the original SRS unit. ■

Disconnect these connectors:

Check for continuity between ECM/PCM connector terminal A3 and body ground.

Is there continuity?

YES	-	Repair short in the wire between ECM/PCM terminals A3 and the gauge control module, the ABS modulator-control unit, the EPS control unit, the SRS unit, or the DLC.■
NO	-	Go to Step 29 .

Check for continuity between ECM/PCM connector terminal A4 and body ground.

Is there continuity?

YES	-	Repair short in the wire between ECM/PCM terminals A4 and the gauge control module, the ABS modulator-control unit, the EPS control unit, the SRS unit, or the DLC.■
NO	-	Go to Step 30 .

Reconnect all connectors.

Connect the HDS to the DLC.

Disconnect the gauge control module 32P connector.

Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?

YES	-	Replace the gauge control module. ■
NO	-	With ABS: Go to Step 34 . Without ABS: Go to Step 38 .

Turn the ignition switch to LOCK (0).

Reconnect the gauge control module 32P connector.

Disconnect the ABS modulator-control unit 25P connector.

Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?

YES	-	Replace the ABS modulator-control unit. ■
NO	-	Go to Step 38 .

Turn the ignition switch to LOCK (0).

Reconnect the ABS modulator-control unit 25P connector (with ABS) or the gauge control module 32P connector (without ABS).

Disconnect EPS control unit connector C (16P).

Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?

YES	-	Replace the EPS control unit. ■
NO	-	Go to Step 42 .

Turn the ignition switch to LOCK (0).

Reconnect EPS control unit connector D (28P).

Disconnect SRS unit connector A (39P).

Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?

YES	-	Replace the SRS unit. ■
NO	-	Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■