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Home >> Mitsubishi >> 2007 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> Diagnostic Item 15

Diagnostic Item 15

DIAGNOSTIC ITEM 15: Diagnose when the scan tool cannot receive the data sent by the ECM or the PCM , and ABS-ECU or ABS/TCL-ECU , and convertible top control module.

Part 1:




Part 2:






CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

FUNCTION
The diagnostic result demonstrates that "the scan tool cannot receive the sent data from the ECM or PCM , ABS-ECU or ABS/TCL-ECU and convertible top control module" when the scan tool MB991958 checks the periodically sent data from each ECU and cannot receive convertible top control module, ABS-ECU or ABS/TCL-ECU and ECM or powertrain control system data only.

TROUBLE JUDGEMENT CONDITIONS
Scan tool MB991958 judges the trouble when the periodically sent data from convertible top control module, ABS-ECU or ABS/TCL-ECU and ECM or PCM cannot be received and sent.

TROUBLESHOOTING HINTS
- The wiring harness may be defective [open circuit between ABS-ECU or ABS/TCL-ECU and joint connector (3) ]
- The connector may be defective [poor connection of joint connector (3) or convertible top control module connector or ABS-ECU connector or ABS/TCL-ECU connector ]
- The ABS-ECU or ABS/TCL-ECU may be defective (internal open circuit)
- The convertible top control module may be defective (internal open circuit)
- The ECM or PCM may be defective (internal open circuit)

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra fine probe
- MB991970: ABS Check Harness










STEP 1. Check joint connector (3) C-03, convertible top control module connector D-45 and ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4.0 inches) from the connector.

Q: Are joint connector (3) C-03, convertible top control module connector D-45 and ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 in good condition?

YES: Go to Step 2.

NO: Repair the damaged parts. Replace the joint connector as necessary.

STEP 2. Check the CAN bus lines between intermediate connector C-23 and joint connector (3). Measure the resistance between intermediate connector C-23 and joint connector (3) C-03.

CAUTION:
- A digital multimeter should be used.
- The test wiring harness should be used.




1. Disconnect intermediate connector C-23 and joint connector (3) C-03, and measure the resistance between the wiring harness side connector of joint connector (3) C-03 and the male side connector of intermediate connector C-23 (at front wiring harness side).
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

3. Disconnect the negative battery terminal.




4. Measure the resistance between intermediate connector C-23 (terminal 22) and joint connector (3) C-03 (terminal 9).

OK: 2 ohms or less




5. Measure the resistance between intermediate connector C-23 (terminal 23) and joint connector (3) C-03 (terminal 20).

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, go to Step 3.

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between intermediate connector C-23 and the joint connector (3) C-03.

STEP 3. Check the CAN bus lines between intermediate connector C-23 and the convertible top control module connector D-45. Measure the resistance between intermediate connector C-23 and convertible top control module connector D-45.

CAUTION:
- A digital multimeter should be used.
- The test wiring harness should be used.







1. Disconnect intermediate connector C-23 and convertible top control module connector D-45, and measure the resistance between the wiring harness side connector of convertible top control module connector D-45 and the male side connector of intermediate connector C-23 (at front wiring harness side).
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

3. Disconnect the negative battery terminal.




4. Measure the resistance between intermediate connector C-23 (terminal 22) and convertible top control module connector D-45 (terminal 48).

OK: 2 ohms or less




5. Measure the resistance between intermediate connector C-23 (terminal 23) and convertible top control module connector D-45 (terminal 49).

OK: 2 ohms or less

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, go to Step 4.

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between intermediate connector C-23 and the convertible top control module connector D-45.

STEP 4. Check the CAN bus lines inside the convertible top control module. Measure the resistance at convertible top control module connector D-45.




1. Disconnect convertible top control module connector D-45, and measure the resistance at the component side of convertible top control module connector D-45.




2. Measure the resistance between convertible top control module connector D-45 (terminals 48 and 37).

OK: 2 ohms or less




3. Measure the resistance between convertible top control module connector D-45 (terminals 49 and 38).

OK: 2 ohms or less

Q: Do all the resistances measure 2 ohms or less?

YES: Intermittent malfunction.

NO: Replace the convertible top control module.

STEP 5. Check the CAN bus lines between intermediate connector C-26 and convertible top control module connector D-45. Measure the resistance between intermediate connector C-26 and convertible top control module connector D-45.

CAUTION:
- A digital multimeter should be used.
- The test wiring harness should be used.







1. Disconnect intermediate connector C-26 and convertible top control module connector D-45, and measure the resistance between the wiring harness side connector of convertible top control module connector D-45 and the male side connector of intermediate connector C-26 (at front wiring harness side).
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

3. Disconnect the negative battery terminal.




4. Measure the resistance between intermediate connector C-26 (terminal 15) and convertible top control module connector D-45 (terminal 37).

OK: 2 ohms or less




5. Measure the resistance between intermediate connector C-26 (terminal 16) and convertible top control module connector D-45 (terminal 38).

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, go to Step 6.

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between intermediate connector C-26 and the convertible top control module connector D-45.

STEP 6. Check the CAN bus lines between intermediate connector C-26 and ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 . Measure the resistance between intermediate connector C-26 and ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 .

CAUTION:
- A digital multimeter should be used.
- The test wiring harness should be used.







1. Disconnect intermediate connector C-26 and ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 , and measure the resistance between the wiring harness side connector of ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 and the male side connector of intermediate connector C-26 (at front wiring harness side).
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

3. Disconnect the negative battery terminal.







4. Measure the resistance between intermediate connector C-26 (terminal 15) and ABS-ECU connector A-02 (terminal 2) or ABS/TCL-ECU connector A-03 (terminal 27).

OK: 2 ohms or less







5. Measure the resistance between intermediate connector C-26 (terminal 16) and ABS-ECU connector A-02 (terminal 8) or ABS/TCL-ECU connector A-03 (terminal 13).

OK: 2 ohms or less

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, go to Step 7.

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between intermediate connector C-26 and the ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 .

STEP 7. Check the CAN bus lines inside the ABS-ECU or ABS/TCL-ECU . Measure the resistance at ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 .




1. Disconnect ABS-ECU connector A-02 or ABS/TCL-ECU A-03 , and measure the resistance at the component side of ABS-ECU connector A-02 or ABS/TCL-ECU connector A-03 .




2. Measure the resistance between ABS-ECU connector A-02 (terminals 2 and 4).

OK: 2 ohms or less




3. Measure the resistance between ABS-ECU connector A-02 (terminals 8 and 6).

OK: 2 ohms or less




4. Measure the resistance between ABS/TCL-ECU connector A-03 (terminals 11 and 27).

OK: 2 ohms or less




5. Measure the resistance between ABS/TCL-ECU connector A-03 (terminals 13 and 15).

OK: 2 ohms or less

Q: Do all the resistances measure 2 ohms or less?

YES: Go to Step 8.

NO: Replace the ABS-ECU or ABS/TCL-ECU .

STEP 8. Check the terminator resistor inside the ECM or PCM . Measure the resistance at ECM or PCM connector B-18.




1. Disconnect ECM or PCM connector B-18, and measure the resistance at the component side of ECM or PCM connector B-18.




2. Measure the resistance between ECM or PCM connector terminals 17 and 18.

OK: 120 ± 20 ohms

Q: Does the resistance measure 120 ± 20 ohms?

YES: Intermittent malfunction.

NO: Replace the ECM or PCM . When the ECM or PCM is replaced, register the encrypted code. Refer to Chassis Electrical - Encrypted Code Registration Criteria Table.
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