DIAGNOSIS Required Special Tool: MB991958: Scan Tool (MUT-III Sub Assembly) MB991824: V.C.I. MB991827: MUT-III USB Cable MB991911: MUT-III Main Harness B

STEP 1. Using scan tool MB991958, check actuator test item 04: Overdrive Solenoid Valve. To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Connect scan tool MB991958 to the data link connector. (2) Turn the ignition switch to the "ON" position. (3) Set scan tool MB991958 to actuator test mode. Item 04: Overdrive Solenoid Valve. An audible clicking or buzzing should be heard when the overdrive solenoid valve is energized. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the solenoid valve operating properly? YES: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions . NO: Go to Step 2 .

STEP 2. Using scan tool MB991958, read the A/T diagnostic trouble code.

(1) Connect scan tool MB991958 to the data link connector. (2) Turn the ignition switch to the "ON" position. (3) Check for A/T diagnostic trouble code. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is DTC 54 set? (DTC 54 may be set along with multiple DTCs). YES: Refer to DTC 54: A/T Control Relay System. NO: Go to Step 3 .

STEP 3. Using scan tool MB991958, read the A/T diagnostic trouble code.

(1) Connect scan tool MB991958 to the data link connector. (2) Turn the ignition switch to the "ON" position. (3) Check for A/T diagnostic trouble code. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Are DTC 32 and DTC 33 set? (Multiple DTCs may be set). YES: Go to Step 8 . NO: Go to Step 4 .

STEP 4. Measure the overdrive solenoid valve resistance at A/T control solenoid valve assembly connector B-02.

(1) Disconnect connector B-02 and measure at the solenoid valve side.

(2) Measure the resistance between solenoid valve assembly connector B-02 terminals 5 and 9. Resistance value: 2.7 - 3.4 Ω [at 20°C (68°F)] Q: Is the measured resistance 2.7 - 3.4 Ω [at 20°C (68°F)]? YES: Go to Step 6 . NO: Go to Step 5 .

STEP 5. Measure the solenoid valve resistance at the overdrive solenoid valve connector B-02-3 inside the transmission.

(1) Disconnect solenoid valve connector B-02-3 and measure at the solenoid valve side.

(2) Measure the resistance between overdrive solenoid valve terminals 1 and 2. Resistance value: 2.7 - 3.4 Ω [at 20°C (68°F)] Q: Is the measured resistance 2.7 - 3.4 Ω [at 20°C (68°F)? YES: Replace the harness wire between A/T control solenoid valve assembly connector B-02 and the solenoid valves. NO: Replace the overdrive solenoid valve. Refer to GROUP 23B, Valve Body .

STEP 6. Check A/T control solenoid valve assembly connector B-02, PCM connector C-92 and intermediate connector C-96 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition? YES: Go to Step 7 . NO: Repair or replace the damaged components. Refer to GROUP 00E, Harness Connector Inspection .

STEP 7. Check the harness for an open or short circuit to ground between A/T control solenoid valve assembly connector B-02 terminal 5 and PCM connector C-92 terminal 130.

Q: Is the harness wire in good condition? YES: Replace the PCM. NO: Repair or replace the harness wire.

STEP 8. Measure the supply voltage at A/T control solenoid valve assembly connector B-02.

(1) Disconnect solenoid valve assembly harness connector B-02. (2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between harness connector B-02 terminal 9 and ground. The voltage should equal battery positive voltage. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the measured voltage battery positive voltage? YES: Go to Step 11 . NO: Go to Step 9 .

STEP 9. Check A/T control solenoid valve assembly connector B-02, intermediate connector C-41 and C-96 and A/T control relay connector C-97 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition? YES: Go to Step 10 . NO: Repair or replace the damaged components. Refer to GROUP 00E, Harness Connector Inspection .

STEP 10. Check the harness for an open circuit or short circuit to ground between A/T control solenoid valve assembly connector B-02 terminal 9 and A/T control relay connector C-97 terminal 3.

Q: Is the harness wire in good condition? YES: Go to Step 11 . NO: Repair or replace the harness wire.

STEP 11. Check A/T control solenoid valve assembly connector B-02, PCM connector C-92 and intermediate connector C-96 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition? YES: Go to Step 12 . NO: Repair or replace the damaged components. Refer to GROUP 00E, Harness Connector Inspection .

STEP 12. Check the harness for an open or short circuit to ground between A/T control solenoid valve assembly connector B-02 (terminals 3, 4 and 5) and PCM connector C-92 (terminals 106, 120 and 130).

Q: Are the harness wires in good condition? YES: Go to Step 13 . NO: Repair or replace the harness wire(s).