Cherokee 2WD L4-150 2.5L VIN H TBI (1988)
CIRCUITS THAT COULD FAULT FAULT CODES
The circuits that could indicate a problem to the ECU and be stored as faults include:
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Modulator Circuit
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Modulator Solenoid Under Voltage
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Brake Switch Circuit
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Low Fluid Level Circuit
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Relay Circuit
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Right Rear Wheel Speed Circuit
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Left Rear Wheel Speed Circuit
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Right Front Wheel Speed Circuit
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Left Front Wheel Speed Circuit
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Pressure Differential Circuit
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Boost Pressure Switch Circuit
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Low Accumulator Switch Circuit
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Booster Pump and Motor Circuit
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ECU Self Check
The ECU is also equipped with a mercury switch mounted at a specific angle which senses vehicle deceleration and provides input to the ECU for
improved system operation on slippery surfaces.
NOTE: Proper mounting angle of the ECU is critical to correct and accurate operation of the mercury switch.
The stored faults can be read by the DRB II tester to assist in diagnosing system faults.
