## Air Conditioning

#### A/C Pressure Switch Circuit Troubleshooting (cont'd)

21-21

1. Reconnect the A/C pressure switch 4P connector.

1. Disconnect the heater control panel connector A (14P).

1. Turn the ignition switch ON (II).

1. Measure the voltage between the No. 4 terminal of heater control panel connector A (14P) and body ground.

HEATER CONTROL PANEL CONNECTOR A (14P)

Wire side of female terminals

Is there battery voltage?

YES - Check for loose wires or poor connections at heater control panel connector A (14P) and at the A/C pressure switch 4P connector. If the connections are good, substitute a known-good heater control panel and recheck. If the symptom/indication goes away, replace the original heater control panel.

NO - Repair open in the wire between the heater control panel and the A/C pressure switch.

1. Check for proper A/C system pressure.

   Is the pressure within specifications?

YES - Replace the A/C pressure switch.

NO - Repair the A/C pressure problem.

Except KE Model

1. Check the No.14 (10 A) fuse in the under-dash fuse/relay box.

   Is the fuse OK?

YES - Go to step 2.

NO - Replace the fuse and recheck.

1. Disconnect the A/C pressure switch 4P connector.

1. Turn the ignition switch ON (II).

1. Measure the voltage between the No. 1 terminal of the A/C pressure switch 4P connector and body ground.

A/C PRESSURE SWITCH 4P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the wire between the A/C diode A, the ECM and the A/C pressure switch.

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