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Component Testing: Abs-Ecu

NOTE: DO NOT short circuit or check resistance of wrong terminals, as it may damage a sensor, wiring, or ABS-ECU.
  1. To check voltage or resistance on ABS-ECU terminals, use Adapter Harness (MB991356). Terminal arrangements on ABS-ECU and special tool will be reversed. Use terminals from special tool when testing (for example, for testing ABS-ECU connector terminal No. 18, use terminal No. 1 on special tool). See Fig 1 .
    Fig 1: Identifying ABS-ECU & Special Tool Connector Terminals
    G95G14684Courtesy of CHRYSLER CORP.
  2. Leaving ABS-ECU connected, turn ignition on. Use a needle-nosed voltmeter wire probe to backprobe ABS-ECU terminals. Ensure voltage is as specified. See ABS-ECU VOLTAGE SPECIFICATIONS table. If voltage is as specified, go to next step. If voltage is not as specified, check related sensor, actuator and wiring. Repair as necessary.
    ABS-ECU VOLTAGE SPECIFICATIONS (1)

    Terminal No. & Check Condition Voltage
    2 (Relay Power Supply Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    6 ("G" Sensor Input)
    Ignition On (2) 2.3-2.7
    17 (LF Solenoid Valve Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    18 (Ignition Switch Input)
    Ignition On Battery Voltage
    Ignition In Start Zero
    22 (Valve Relay Monitor Input)
    Ignition Off Zero
    Ignition On Battery Voltage
    23 (Diagnostic Communication Input/Output)
    Scan Tool Connected (3)
    Scan Tool Disconnected One Volt Or Less
    24 (Diagnostic Selection Input)
    Scan Tool Connected Zero
    Scan Tool Disconnected Approx. 12
    25 (ABS Warning Light Output)
    Ignition On Battery Voltage
    29 (Stoplight Switch Input)
    Ignition Off, Stoplight Switch Off 1.5 Or More
    Ignition On, Stoplight Switch On 5 Or More
    35 (RF Solenoid Valve Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    (1) Unless otherwise indicated, specifications are with ignition on, engine off.
    (2) With vehicle parked on level surface.
    (3) Serial communication with scan tool.
    ABS-ECU VOLTAGE SPECIFICATIONS (1)

    Terminal No. & Check Condition Voltage
    1 (Rear Solenoid Valve Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    2 (Relay Power Supply Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    4 (Generator Input)
    Ignition On 2-5
    Ignition On (2) Battery Voltage
    17 (LF Solenoid Valve Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    18 (Ignition Switch Input)
    Ignition On Battery Voltage
    Ignition In Start Zero
    19 (RF Solenoid Valve Output)
    Ignition Off Zero
    Ignition On Battery Voltage
    22 (Valve Relay Monitor Input)
    Ignition Off Zero
    Ignition On Battery Voltage
    23 (Diagnostic Communication Input/Output)
    Scan Tool Connected (3)
    Scan Tool Disconnected One Volt Or Less
    24 (Diagnostic Selection Input)
    Scan Tool Connected Zero
    Scan Tool Disconnected Approx. 12
    25 (ABS Warning Light Output)
    Ignition On Battery Voltage
    29 (Stoplight Switch Input)
    Ignition Off, Stoplight Switch Off 1.5 Or More
    Ignition On, Stoplight Switch On 5 Or More
    (1) Unless otherwise indicated, specifications are with ignition on, engine off.
    (2) With engine running.
    (3) Serial communication with scan tool.
  3. Ensure ignition is off. Disconnect ABS-ECU connector. Using an ohmmeter, check resistance between indicated ABS-ECU wiring harness terminals. Use Adapter Harness (MB991356) for checking contact pin pressure instead of inserting a test probe. See ABS-ECU RESISTANCE SPECIFICATIONS table. SeeFig 1 and Figure . If resistance is as specified, ABS-ECU is okay. If resistance is not as specified, check related sensor, actuator and wiring. Repair as necessary.
ABS-ECU RESISTANCE SPECIFICATIONS

Terminals No. & Check Condition Ohms
5 & Ground (Motor Monitor)
At All Times Continuity
9 & Ground (ABS-ECU Ground)
At All Times Continuity
10 & 11 (LR Wheel Speed Sensor)
Ignition Off 1000-1200
20 & Ground ("G" Sensor Ground)
At All Times Continuity
26 & 2 (Motor Relay)
Ignition Off Approx. 50
27 & 2 (Valve Relay)
Ignition Off Approx. 100
28 & 30 (RR Wheel Speed Sensor)
Ignition Off 1000-1200
31 & 33 (RF Wheel Speed Sensor)
Ignition Off 1000-1200
32 & 15 (LF Wheel Speed Sensor)
Ignition Off 1000-1200
34 & Ground (ABS-ECU Ground)
At All Times Continuity
ABS-ECU RESISTANCE SPECIFICATIONS

Terminals No. & Check Condition Ohms
5 & Ground (Motor Monitor)
At All Times Continuity
8 & 33 (RF Wheel Speed Sensor)
Ignition Off 1000-1200
10 & 11 (LR Wheel Speed Sensor)
Ignition Off 1000-1200
14 & 15 (LF Wheel Speed Sensor)
Ignition Off 1000-1200
20 & Ground (ABS-ECU Ground)
At All Times Continuity
26 & 2 (Motor Relay)
Ignition Off Approx. 50
27 & 2 (Valve Relay)
Ignition Off Approx. 100
28 & 30 (RR Wheel Speed Sensor)
Ignition Off 1000-1200
34 & Ground (ABS-ECU Ground)
At All Times Continuity
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