C1242

C1217/C1242: Pump Motor Circuit Shorted to Ground/Open








CIRCUIT DESCRIPTION
Pump motor is contained within Brake Pressure Modulator Valve (BPMV). Pump motor ground is supplied through terminal Ell 36-3 of EBCM. Battery voltage is supplied to EBCM terminal E136-15 when ignition switch is turned on. EBCM terminals E136-1 and E136-2 are 'hot at all times.'

CONDITIONS FOR SETTING THE DTC
^ DTC C1217 can only be set with ignition key in the "ON" position, pump motor is off, and EBCM detected a short to ground on pump motor circuit.
^ DTC C1242 can only be set with ignition key in the "ON" position, pump motor is off, and EBCM detected high resistance or an open circuit across motor .

ACTION TAKEN WHEN THE DTC SETS
^ ABS relay opens, removing power from pump motor and solenoids.
^ DTC (C1217 or C1242) is stored.
^ ABS disabled, ABS warning light is turned on.

DIAGNOSTIC AIDS
Typical Causes of DTC C1217.
^ Faulty BPMV.
^ Faulty EBCM.
Typical Causes Of DTC C1242.
^ BPMV pump motor open or high resistance.
^ EBCM malfunction.

INSPECTION

NOTE: Diagnostic flow table must be performed first before this inspection.

^ Substitute a known-good ABS actuator (EBCM & BPMV) assembly and recheck. Replace as necessary.