Module Communications Network: Diagnosis Ford Focus I рестайлинг

Inspection And Verification

1. Verify the customer concern.
2. Visually inspect obvious signs of mechanical or electrical damage. VISUAL INSPECTION CHART Electrical Fuse(s) Wiring harness Loose or corroded connector(s) Damaged connector(s)
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position.

If the diagnostic tool still does not communicate with the vehicle, Go To PINPOINT TEST J: NO MODULE/NETWORK COMMUNICATION .

Go To PINPOINT TEST PC: RUN THE DATA LINK DIAGNOSTICS TEST .

PINPOINT TEST PC: RUN THE DATA LINK DIAGNOSTICS TEST

PC1 DATA LINK DIAGNOSTICS TEST

1. Carry out the data link diagnostics test.
2. Is system passed obtained?

Yes

RETURN to the Symptom Chart for the module in question.

No

If ISO circuit faults; all electronic control units no response/not equipped, Go To PINPOINT TEST G: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 NETWORK COMMUNICATION .

If SCP+ circuit faults; all electronic control units no response/not equipped, Go To PINPOINT TEST H: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION .

If SCP- circuit faults; all electronic control units no response/not equipped, Go To PINPOINT TEST H: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION .

If CAN+ circuit faults; all electronic control units no response/not equipped, Go To PINPOINT TEST I: NO CAN NETWORK COMMUNICATION - 2.3L ONLY .

If CAN- circuit faults; all electronic control units no response/not equipped, Go To PINPOINT TEST I: NO CAN NETWORK COMMUNICATION - 2.3L ONLY .

If no response from the diagnostic tool, Go To PINPOINT TEST J: NO MODULE/NETWORK COMMUNICATION .

Symptom Chart

SYMPTOM CHART

PINPOINT TEST A: THE ABS MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

A1 CHECK CIRCUITS 8-EE10 (WH/BK) AND 8-EE6A (WH) BETWEEN THE DLC C251 AND THE ABS MODULE C135 FOR AN OPEN

Scheme 2

1. Key in OFF position.
2. Disconnect: ABS Module C135.
3. Measure the resistance between the ABS module C135 pin 2, circuit 8-EE6A (WH), harness side and the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side.
4. Is the resistance less than 5 ohms?

Yes

GO to A2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A2 CHECK FOR CORRECT ABS MODULE OPERATION

1. Disconnect all the ABS module connectors.
2. Check for: corrosion pushed-out pins
3. Connect all the ABS control module connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CARRY OUT the data link diagnostics test. Clear the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST B: THE PCM DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

B1 CHECK THE VEHICLE ENGINE

1. Check the vehicle for engine type.
2. Is the vehicle equipped with a 2.0L SVT or a 2.3L engine?

Yes

GO to B3.

No

GO to B2.

B2 CHECK SCP CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN

Scheme 3

1. Key in OFF position.
2. Disconnect: PCM C175.
3. Measure the resistance between the PCM C175 pin 16, circuit 4-EG9 (GY/OG), harness side and the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side: and between the PCM C175 pin 15, circuit 5-EG9 (BU/BK), harness side and the DLC C251 pin 10, circuit 5-EG6 (BU), harness side.
4. Are the resistances less than 5 ohms?

Yes

GO to B4.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

B3 CHECK CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN

Scheme 4

Scheme 5

1. Key in OFF position.
2. Disconnect: PCM C175 (2.0L SVT) or C175b (2.3L).
3. For 2.3L, measure the resistance between the PCM C175b pin 11, circuit 4-EC7 (GY/RD), harness side and the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side; and between the PCM C175b pin 23, circuit 5-EC7 (BU/RD), harness side and the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side.
4. For 2.0L SVT, measure the resistance between the PCM C175 pin 50, circuit 4-EC7 (GY/RD), harness side and the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side; and between the PCM C175 pin 49, circuit 5-EC7 (BU/RD), harness side and the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side.
5. Are the resistances less than 5 ohms?

Yes

GO to B4.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

B4 CHECK FOR CORRECT PCM OPERATION

1. Disconnect all PCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all PCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new PCM. REFER to POWERTRAIN CONTROL MODULE (PCM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST C: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

C1 CHECK CIRCUITS BETWEEN THE DLC AND THE INSTRUMENT CLUSTER FOR AN OPEN

Scheme 6

Scheme 7

Scheme 8

1. Key in OFF position.
2. Disconnect: Instrument Cluster C2220 or C220.
3. Disconnect: Auxiliary Instrument Cluster C2271 2.0L SVT (if equipped).
4. For 2.3L, measure the resistance between the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side and the instrument cluster C2220 pin 31, circuit 4-EC7B (GY/RD), harness side; and between the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side and the instrument cluster C2220 pin 15, circuit 5-EC7B (BU/RD), harness side.
5. For all 2.0L, measure the resistance between the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side and the instrument cluster C220 pin 13 circuit 4-EG8 (GY/VT), harness side; and between the DLC C251 pin 10, circuit 5-EG7 (BU/RD), harness side and the instrument cluster C220 pin 26, circuit 5-EG8 (BU/WH), harness side.
6. For 2.0L SVT auxiliary instrument cluster, measure the resistance between the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side and the auxiliary instrument cluster C2271 pin 6, circuit 4-EG2 (GY/RD), harness side; and between the DLC C251 pin 10, circuit 5-EG7 (BU/RD), harness side and the auxiliary instrument cluster C2271 pin 7, circuit 5-EG2 (BU/RD), harness side.
7. Are the resistances less than 5 ohms?

Yes

GO to C2.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

C2 CHECK FOR CORRECT INSTRUMENT CLUSTER OR AUXILIARY INSTRUMENT CLUSTER OPERATION

1. Disconnect all instrument cluster or auxiliary instrument cluster connectors.
2. Check for: corrosion pushed-out pins
3. Connect all instrument cluster or auxiliary instrument cluster connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new instrument cluster or auxiliary instrument cluster. REFER to INSTRUMENT CLUSTER or INSTRUMENT CLUSTER -- SVT . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST D: THE GEM DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

D1 CHECK CIRCUITS BETWEEN THE GEM AND THE DLC FOR AN OPEN

Scheme 9

1. Key in OFF position.
2. Disconnect: GEM C201d.
3. Measure the resistance between the GEM C201 d pin 16, circuit 8-EE9 (WH/GN), harness side and the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side.
4. Is the resistance less than 5 ohms?

Yes

GO to D2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

D2 CHECK FOR CORRECT GEM OPERATION

1. Disconnect all GEM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all GEM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new GEM module. REFER to GENERIC ELECTRONIC MODULE (GEM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST E: THE RCM DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

E1 CHECK CIRCUITS BETWEEN THE RCM AND THE DLC FOR AN OPEN

Scheme 10

1. Key in OFF position.
2. Deactivate the airbag system. Refer to «DISABLING SYSTEM»(ref-170306-S06776258282005011000000) .
3. Disconnect: RCM C2041b.
4. Measure the resistance between the RCM C2041b pin 15, circuit 8-EE7 (WH/RD), harness side and the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side.
5. Is the resistance less than 5 ohms?

Yes

GO to E2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

E2 CHECK FOR CORRECT RCM OPERATION

1. Disconnect all the RCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all the RCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST F: NO PCM STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION - 2.0L SVT

F1 CHECK CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN

Scheme 11

1. Key in OFF position.
2. Disconnect: PCM C175.
3. Measure the resistance between the PCM C175 pin 16, circuit 4-EG9 (GY/OG), harness side and the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side: and between the PCM C175 pin 15, circuit 5-EG9 (BU/BK), harness side and the DLC C251 pin 10, circuit 5-EG6 (BU), harness side.
4. Are the resistances less than 5 ohms?

Yes

GO to F2.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

F2 CHECK FOR CORRECT PCM OPERATION

1. Disconnect all PCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all PCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new PCM. REFER to POWERTRAIN CONTROL MODULE (PCM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST G: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 NETWORK COMMUNICATION

G1 CHECK CIRCUITS BETWEEN THE GEM AND THE DLC FOR AN OPEN

Scheme 12

1. Key in OFF position.
2. Disconnect: GEM C201d.
3. Measure the resistance between the GEM C201 d pin 16, circuit 8-EE9 (WH/GN), harness side and the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side.
4. Is the resistance less than 5 ohms?

Yes

GO to G2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

G2 CHECK THE ISO 9141 NETWORK WITH THE GEM DISCONNECTED

1. Key in ON position.
2. Carry out the data link diagnostics test.
3. Does the diagnostic tool indicate system passed?

Yes

GO to G6.

No

GO to G3.

G3 CHECK THE ISO 9141 NETWORK WITH THE ABS DISCONNECTED

1. Key in OFF position.
2. Disconnect: ABS Module C135.
3. Key in ON position.
4. Carry out the data link diagnostics test.
5. Does the diagnostic tool indicate system passed?

Yes

GO to G7.

No

GO to G4.

G4 CHECK THE ISO 9141 NETWORK WITH THE RCM DISCONNECTED

Scheme 13

1. Key in OFF position.
2. Deactivate the airbag system. Refer to «DISABLING SYSTEM»(ref-170306-S06776258282005011000000) .
3. Disconnect: RCM C2041b.
4. Key in ON position.
5. Measure the voltage between the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side and ground.
6. Is any voltage indicated?

Yes

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No

GO to G5.

G5 CHECK THE ISO 9141 NETWORK FOR A SHORT TO GROUND

Scheme 14

1. Key in OFF position.
2. Measure the resistance between the DLC C251 pin 7, circuit 8-EE10 (WH/BK), harness side and ground.
3. Is the resistance greater than 10,000 ohms?

Yes

GO to G8.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

G6 CHECK FOR CORRECT GEM OPERATION

1. Disconnect all GEM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all GEM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new GEM module. REFER to GENERIC ELECTRONIC MODULE (GEM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

G7 CHECK FOR CORRECT ABS OPERATION

1. Disconnect all ABS connectors.
2. Check for: corrosion pushed-out pins
3. Connect all ABS connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CARRY OUT the data link diagnostics test. Clear the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

G8 CHECK FOR CORRECT RCM OPERATION

1. Disconnect all the RCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all the RCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST H: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION

H1 CHECK THE SCP CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN

Scheme 15

1. Key in OFF position.
2. Disconnect: PCM C175.
3. Measure the resistance between the PCM C175 pin 16, circuit 4-EG9 (GY/OG), harness side and the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side: and between the PCM C175 pin 15, circuit 5-EG9 (BU/BK), harness side and the DLC C251 pin 10, circuit 5-EG6 (BU), harness side.
4. Are the resistances less than 5 ohms?

Yes

GO to H2.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

H2 CHECK SCP CIRCUITS FOR SHORT TO VOLTAGE

Scheme 16

1. Disconnect: Instrument Cluster C220.
2. Disconnect: ABS Module C135 (if equipped with traction control or stability assist).
3. Disconnect: Auxiliary Instrument Cluster C2271 (2.0L SVT).
4. Key in ON position.
5. Measure the voltage between the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side and ground; and between the DLC C251 pin 10, circuit 5-EG7 (BU/RD), harness side and ground.
6. Is any voltage indicated?

Yes

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No

GO to H3.

H3 CHECK SCP CIRCUITS FOR SHORT TO GROUND

Scheme 17

1. Key in OFF position.
2. Measure the resistance between the DLC C251 pin 2, circuit 4-EG7 (GY/RD), harness side and ground; and between the DLC C251 pin 10, circuit 5-EG7 (BU/RD), harness side and ground.
3. Are the resistances greater than 10,000 ohms?

Yes

For 2.0L SVT, GO to H4.

For vehicles with traction control or stability assist, GO to H6.

For vehicles without traction control or stability assist, GO to H8.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

H4 CHECK THE AUXILIARY INSTRUMENT CLUSTER

1. Connect: Instrument Cluster C220.
2. Connect: PCM C175.
3. Connect: ABS C135.
4. Key in ON position.
5. Carry out the data link diagnostics test.
6. Does the diagnostic tool indicate system passed?

Yes

GO to H9.

No

GO to H5.

H5 CHECK THE ABS MODULE

1. Key in OFF position.
2. Connect: Auxiliary Instrument Cluster C2271.
3. Disconnect: ABS Module C135.
4. Key in ON position.
5. Carry out the data link diagnostics test.
6. Does the diagnostic tool indicate system passed?

Yes

GO to H10.

No

GO to H7.

H6 CHECK THE ABS MODULE FOR SHORT

1. Connect: Instrument Cluster C220.
2. Connect: PCM C175.
3. Key in ON position.
4. Carry out the data link diagnostics test.
5. Does the diagnostic tool indicate system passed?

Yes

GO to H10.

No

GO to H7.

H7 CHECK THE PCM

1. Key in OFF position.
2. Connect: ABS C135.
3. Substitute the PCM with a known good PCM.
4. Connect: PCM C175.
5. Key in ON position.
6. Carry out the data link diagnostics test.
7. Does the diagnostic tool indicate system passed?

Yes

GO to H12.

No

GO to H11.

H8 CHECK THE PCM FOR A SHORT

1. Connect: Instrument Cluster C220.
2. Substitute the PCM with a known good PCM.
3. Connect: PCM C175.
4. Key in ON position.
5. Carry out the data link diagnostics test.
6. Does the diagnostic tool indicate system passed?

Yes

GO to H12.

No

GO to H11.

H9 CHECK FOR CORRECT AUXILIARY INSTRUMENT CLUSTER OPERATION

1. Disconnect all auxiliary instrument cluster connectors.
2. Check for: corrosion pushed-out pins
3. Connect all auxiliary instrument cluster connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new auxiliary instrument cluster. REFER to INSTRUMENT CLUSTER or INSTRUMENT CLUSTER -- SVT . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

H10 CHECK FOR CORRECT ABS MODULE OPERATION

1. Disconnect all the ABS module connectors.
2. Check for: corrosion pushed-out pins
3. Connect all the ABS module connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . Clear the DTCS. CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

H11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

1. Disconnect all the instrument cluster connectors.
2. Check for: corrosion pushed-out pins
3. Connect all the instrument cluster connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER or INSTRUMENT CLUSTER -- SVT . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

H12 CHECK FOR CORRECT PCM OPERATION

1. Disconnect all PCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all PCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new PCM. REFER to POWERTRAIN CONTROL MODULE (PCM) . CARRY OUT the data link diagnostics test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST I: NO CAN NETWORK COMMUNICATION - 2.3L ONLY

I1 CHECK CAN CIRCUITS BETWEEN THE DLC AND THE INSTRUMENT CLUSTER FOR AN OPEN

Scheme 18

1. Key in OFF position.
2. Disconnect: Instrument Cluster C2220.
3. Measure the resistance between the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side and the instrument cluster C2220 pin 31, circuit 4-EC7B (GY/RD), harness side; and between the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side and the instrument cluster C2220 pin 15, circuit 5-EC7B (BU/RD), harness side.
4. Are the resistances less than 5 ohms?

Yes

GO to I2.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

I2 CHECK THE CAN NETWORK FOR A SHORT TO VOLTAGE

Scheme 19

1. Disconnect: PCM C175b.
2. Key in ON position.
3. Measure the voltage between the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side and ground; and between the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side and ground.
4. Is any voltage indicated?

Yes

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No

GO to I3.

I3 CHECK THE CAN NETWORK FOR A SHORT TO GROUND

Scheme 20

1. Key in OFF position.
2. Measure the resistance between the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side and ground; and between the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side and ground.
3. Are the resistances greater than 10,000 ohms?

Yes

GO to I4.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

I4 CHECK CAN CIRCUITS BETWEEN THE DLC AND THE INSTRUMENT CLUSTER FOR RESISTANCE

Scheme 21

1. Connect: Instrument Cluster C2220.
2. Measure the resistance between the DLC C251 pin 6, circuit 4-EC7 (GY/RD), harness side and between the DLC C251 pin 14, circuit 5-EC7 (BU/RD), harness side.
3. Is the resistance between 40 and 80 ohms?

Yes

GO to I5.

No

GO to I6.

I5 CHECK FOR CORRECT PCM OPERATION

1. Disconnect all PCM connectors.
2. Check for: corrosion pushed-out pins
3. Connect all PCM connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new PCM. REFER to POWERTRAIN CONTROL MODULE (PCM) . CARY OUT the date link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

I6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

1. Disconnect all instrument cluster connectors.
2. Check for corrosion pushed-out pins
3. Connect all instrument cluster connectors and make sure they seat correctly.
4. Operate the system and verify the concern is still present.
5. Is the concern still present?

Yes

INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER or INSTRUMENT CLUSTER -- SVT . CARRY OUT the data link diagnostics test. CLEAR the DTCs. REPEAT the self-test.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

PINPOINT TEST J: NO MODULE/NETWORK COMMUNICATION

J1 CHECK THE VOLTAGE TO THE DLC C251 PIN 16, CIRCUIT 29-RA1 (OG)

Scheme 22

1. Measure the voltage between the DLC C251 pin 16, circuit 29-RA1 (OG), harness side and ground.
2. Is the voltage greater than 10 volts?

Yes

GO to J2.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

J2 CHECK THE DLC GROUND CIRCUITS 31-RA1 (BK) AND 91-RA1 (BK/OG) FOR AN OPEN

Scheme 23

1. Measure the resistance between the DLC C251 pin 4, circuit 31-RA1 (BK), harness side and ground; and between the DLC C251 pin 5, circuit 91-RA1 (BK/OG), harness side and ground.
2. Are the resistances less than 5 ohms?

Yes

CHECK the diagnostic tool. REFER to the diagnostics tool operating manual.

No

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test