MIL ON - EGI Harness Wire Breakage Diagnosis & Repair: Overview

Classification:
EC97-018b

Reference:
NTB98-008b

Date:
September 16, 1999

Subject:
1995-99 MAXIMA EGI HARNESS WIRE BREAKAGE DIAGNOSIS AND REPAIR PROCEDURE

APPLIED VEHICLES:
1995-99 Maxima (A32)

SERVICE INFORMATION

If a 1995-99 Maxima has any of the following incidents:

^ MIL "on",

^ Engine no start, or

^ Other system malfunctions such as A/C mop, A/C idle up mop, rough idle, oil pressure light mop,





The cause may be wire breakage in the engine control harness where it bends over the right rear of the engine next to the right strut tower (see Figure 1). See the symptom charts for possible diagnostic trouble codes (DTCs) or specific symptoms that can cause one or more of these incidents.

This repair procedure may apply to your MIL "on" DTC symptom if it is specifically listed on the charts. Note that for each DTC or symptom listed there can be more than one circuit to check using the following procedure.

Only incidents and circuits listed on the attached chart are applicable to this bulletin. All of the incident possibilities are circuits contained in wiring that pass through the bend in the engine control harness.

A kit (P/N 24299-0L725) containing a harness protector and four clips must be installed to prevent

additional wire breakage.

SERVICE PROCEDURE

Diagnosis Procedure - MIL "ON"

Use this procedure when the vehicle has come in with the MIL "on" and a DTC stored in Self-Diagnosis memory.

1. Use CONSULT to display Self-Diagnosis Results.

2. Compare the DTC displayed by CONSULT to the DTC Charts (Chart # 5 1, 2, 3 and 4).

3. CONSULT can be used in Data Monitor mode as a preliminary check. Monitor the operation of the system indicated by the DTC.

4. Check for intermittent open or short circuits by aggressively wiggling the EGI harness side to side and up and down at the specified harness bend (see Figure 1) while watching the results on CONSULT Data Monitor. If the applicable monitored value changes or a DTC sets when you shake the harness then wire damage has been confirmed (see NOTE 1).

5. Use the correct year service manual Trouble Diagnosis for the DTC displayed together with the DTC chart to identify the wire color and pin location for the circuit in question.

^ If the wire color code is listed on the DTC chart, perform continuity check A.

^ If the wire is identified as "shielded wire" on the DTC chart, perform continuity checks A and B.

6. Perform the indicated continuity check(s) on the wire(s)for the circuit in question to isolate the short or open to the incident wire(s). It may be necessary to shake the harness as outlined in step 4 to verify intermittent conditions. Ohmmeter values should not change while shaking the harness (see NOTE 1 below).

^ If an open circuit is confirmed in a color-coded wire, perform the repair procedure.

^ If the open or short is confirmed in a "shielded wire," replace the entire harness.

NOTE 1: If you cannot confirm an open or short circuit with CONSULT, it is necessary to perform the continuity check outline in steps 5 and 6 above. If you cannot confirm an open or short in the specified wire(s) as they pass through the indicated harness bend with the continuity check, this bulletin does not apply.

Diagnosis Procedure - Non MIL Symptom

Use this procedure if the vehicle symptom is listed on the Vehicle Symptom Chart (Chart 5).

1. Verify the symptom in question is listed in Chart 5.

2. Refer to the system wiring diagram in the correct year service manual together with Chart 5 to determine the wire colors and pin location for the circuit in question.


3. Perform continuity check A on the wire(s)for the circuit in question to isolate the short or open to the incident wire(s).

4. Check for intermittent open or short circuits by aggressively wiggling the EGI harness side to side and up and down at the specified harness bend and performing the indicated continuity check(s). If ohmmeter values change while shaking the harness the wire damage has been confirmed (see NOTE 2 below).

^ If an open circuit is confirmed in a color-coded wire, perform the repair procedure for color-coded wires.

NOTE 2: If you cannot confirm an open or short circuit in the specified wire(s) as they pass through the indicated harness bend, this bulletin does not apply.




PARTS INFORMATION

NOTE: You can order the kit only; not individual components.


CLAIMS INFORMATION

When applicable, standard claims coding applies.