Test J
PINPOINT TEST J: FULL HEAT ONLY IN ALL MODESTest J1-J2:
Test J3-J4:
Test J5-J6:
Test J7-J8:
Test J8-J9:
Test J10-J11:
Test J12-J13:
Test J14-J15:
Test J15-J16:
Test J16-J17:
Normal Operation
Under normal operation, the coolant control valve receives battery voltage through circuit 30-FB3 (RD/OG)/30-FA1 (RD). The coolant control valve is provided a ground through circuit 91S-FB3 (BN/BL) and/or 91S-FB4 (BN/GN) from the Dual Automatic Temperature Control (DATC) module, depending on which side of the heater core the warm coolant is to flow through.
Under normal operation, the auxiliary coolant pump relay coil receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 91S-FA76 (BN/BL). The Coil receives battery voltage through circuit 30-FA74 (RD/GN). Battery voltage is supplied to the relay contacts from circuit 30-FA74 (RD/GN). When the relay coil is energized, voltage is delivered to the auxiliary coolant pump motor through circuit 30S-FB1 (RD/YE). Ground for the motor is provided through circuit 31-FB1 (BK/YE).
Possible Causes
- An open in circuit 30-FB3 (RD/OG)/30-FA1 (RD), 91S-FB3 (BN/BL) or 91S-FB4 (BN/GN).
- A short to ground or voltage in circuit 91S-FB3 (BN/BL) or 91S-FB4 (BN/GN).
- A short to voltage in circuit 91S-FB3 (BN/BL) or 91S-FB4 (BN/GN).
- Coolant control valve.
- Evaporator discharge air temperature sensor.
- DATC module.