2004 MITSUBISHI ENDEAVOR ECU

Fig. 66: Solenoid Valve And Moter Power Supply Circuit Diagram & Connector Identification

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
CIRCUIT OPERATION
The ABS-ECU contains the power supply circuit (terminal 19) for the pump
motor. The pump motor is energized by the motor relay, which is incorporated
in the ABS-ECU. The motor relay, which is incorporated in the ABS-ECU, is always off unless
the motor solenoid valve check is activated when the vehicle is started. The ABS-ECU activates the pump motor by turning on the ECU built-in motor
relay when the ABS is working.
ABS DTC SET CONDITIONS These diagnostic trouble codes will be set under the cases below.
DTC C1266: Motor system (seizure)
If the ABS-ECU determines that the pump motor is not running smoothly (i.e.
motor seizure) after the motor relay is turned off, this DTC will be set.
DTC C1273: Motor relay problem (stuck off) If the ABS-ECU determines that the motor is not running after the motor relay
is turned on, the ECU determines that the motor relay is stuck off, and sets this
DTC.
DTC C1274: Motor relay problem (stuck on) If the ABS-ECU determines that the motor is running after the motor relay is
turned off, the ECU determines that the motor relay is stuck on, and sets this
DTC. CAUTION: If there is any problem in the CAN bus lines, an
incorrect diagnostic trouble code may be set. Prior to
this diagnosis, diagnose the CAN bus lines.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DTCS ARE TO SET ARE:)
Current trouble
Damaged wiring harness or connector Malfunction of the hydraulic unit (integrated with ABS-ECU)
PAST TROUBLE
Carry out diagnosis with particular emphasis on connector(s) or wiring harness
in the power supply circuit (terminal 19) to the ABS-ECU motor or ground
circuit (terminal 18). For diagnosis procedures, refer to (Refer to HOW TO TREAT PAST TROUBLE
).
DIAGNOSIS Required Special Tools:
MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A
MB991970: ABS Check Harness
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
1. Connect scan tool MB991958 to the data link connec
tor. CAUTION: To prevent damage to scan tool MB991958,
always turn the ignition switch to the
"LOCK" (OFF) position before connecting or
disconnecting scan tool MB991958.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

6. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1266, C1273, or C1274 set?
YES: Go to Step 3.
NO: The procedure is complete.
STEP 3. Measure the voltage at ABS-ECU connector A-02.
1. Disconnect the connector A-02, and connect special tool ABS Check
Harness (MB991970) to the wiring harness-side connector.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 19 and ground. It should be
a
pproximatel
y 12 volts
(batter
y positive volta
ge). NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

Fig. 69: Measuring Voltage At ABS
-ECU Connector A
-02
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

Q: Is the voltage approximately 12 volts (battery positive voltage)?
YES: Go to Step 5 .
NO: Go to Step 4.
STEP 4. Check ABS-ECU connector A-02 for loose, corroded or damaged
terminals, or terminals
pushed back in the connector
.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

Fig. 70: Checking ABS
-ECU Connector A
-02
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is ABS-ECU connector A-02 damaged?

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

YES: Repair or replace the damaged component(s). Then go to Step 8 .
NO: An open or short circuit may be present in the solenoid valve power
supply circuit. Repair the wiring harness between ABS-ECU connector A-
02 terminal 19 and fusible link No.3. Then go to Step 8 .
STEP 5. Measure the resistance at ABS-ECU connector A-02.
1. Disconnect the connector A-02, and connect special tool ABS Check
Harness (MB991970) to the wiring harness-side connector.
2. Measure the resistance between terminal 18 and ground. It should be 2
ohms or less. NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor

Fig. 71: Measuring Resistance At ABS
-ECU Connector A
-02
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor LS
2004 BRAKES Anti-Lock Braking System (ABS) - Endeavor