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Component Testing: Abs-Ecu

NOTE: DO NOT short circuit or check resistance of wrong terminals, as it may damage 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 .
  2. Leaving ABS-ECU connected, use a needle-nosed voltmeter wire probe to backprobe ABS-ECU terminals. Ensure voltage is as specified. See appropriate 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.
  3. Turn ignition 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 appropriate ABS-ECU RESISTANCE SPECIFICATIONS table. See Fig 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 VOLTAGE SPECIFICATIONS

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 (1) 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 (4) 1.5 Or More
Ignition On (5) 5 Or More
(1) With engine stopped.
(2) With engine running.
(3) Serial communication with scan tool.
(4) Stoplight switch off.
(5) Stoplight switch on.
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
Fig 1: Locating ABS-ECU & Special Tool (MB991356) Connector Terminals
G95G14684Courtesy of CHRYSLER CORP.
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