TIMER CONTROL VALVE (TCV) INSPECTION [WL-3]

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Continuity Inspection

Note
•  Perform the following test only when directed.

1.  Disconnect the negative battery cable.

2.  Disconnect the injection pump connector A.

3.  Inspect for continuity between the terminals B and C using an ohmmeter.

•  If no continuity is detected, perform resistance inspection.
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Resistance inspection

1.  Disconnect the negative battery cable.

2.  Disconnect the injection pump connector D.

•  Consult authorized BOSCH parts distributor for repair if the timer control valve (TCV) is possibly malfunctioning.
•  If as specified, carry out the “Circuit Open/Short Inspection.”
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Specification

Terminal

Atmospheric temperature

(°C {°F})

Resistance (ohm)
A—B
10—30 {50—86}
10.3—11.7


Circuit Open/Short Inspection

1.  Inspection for an open or short circuit in the following wiring harnesses.

•  If there is an open or short circuit, repair or replace wiring harnesses.


Open circuit

•  Power circuit (Injection pump connector D terminal A and main relay terminal D).
•  Signal circuit (Injection pump connector D terminal B and PCM terminal 4U)


Short circuit

•  Injection pump connector D terminal B and PCM terminal 4U to ground.