Circuit Test Roc - Relay Output Check

Fig 1: ACR Relay Connector Terminal ID (ROC - 2.5L)

Fig 2: FPR Relay Connector Terminal ID (ROC - 2.5L)

Fig 3: HCFAN Relay Connector Terminal ID (ROC - 2.5L)

Fig 4: HFAN Relay Connector Terminal ID (ROC - 2.5L)

Fig 5: LCFAN Relay Connector Terminal ID (ROC - 2.5L)

Fig 6: LFAN Relay Connector Terminal ID (ROC - 2.5L)

NOTE: Enter this test when a Code 67 is displayed during self-test procedures (KOEO or KOER) or when directed here from another circuit test or SWITCH MONITOR TEST. This test is intended to diagnose following relays and circuits: A/C Relay (ACR), Fuel Pump Relay (FPR), High Condenser Fan Relay (HCFAN), High Cooling Fan Relay (HFAN), Low Condenser Fan Relay (LCFAN), Low Cooling Fan Relay (LFAN) and Wide Open Throttle A/C Cutoff Relay (WAC).

CIRCUIT PIN IDENTIFICATION

Relay

Breakout Box Pin No.

PCM Pin

Wire Color

ACR ⁽¹⁾

Green/Black

FPR ⁽²⁾

⁽⁵⁾ 52B

Light Green

HCFAN ⁽⁶⁾

Blue/Green

HFAN ⁽³⁾

Blue/Green

LCFAN ⁽⁷⁾

⁽⁸⁾ 53A

Blue/Orange

LFAN ⁽⁴⁾

Red/White

⁽¹⁾	When A/C is selected, PCM grounds ACR wire to turn A/C system on.

⁽²⁾	PCM grounds FPR wire to energize fuel pump.

⁽³⁾	PCM grounds HFAN wire to energize high cooling fan.

⁽⁴⁾	PCM grounds LFAN wire to energize low cooling fan.

⁽⁵⁾	Ensure Breakout Box Adapter (T92C-6000-AH) selector switch is in "B" position.

⁽⁶⁾	PCM grounds HCFAN wire to energize high condenser fan.

⁽⁷⁾	PCM grounds LCFAN wire to energize low condenser fan.

⁽⁸⁾	Ensure Breakout Box Adapter (T92C-6000-AH) selector switch is in "A" position.

1) Check System Integrity Visually check all wiring, connectors and components for evidence of damage, shorting or looseness. If fault is found, repair as necessary. If no fault is found, go to next step.

WARNING: Fans will operate when HCFAN, HFAN, LCFAN or LFAN wires are grounded.

2) Perform Relay Click Test Turn ignition off. Install breakout box (PCM disconnected). Locate relay to be tested. Turn ignition on. Feel and/or listen to relay while grounding appropriate relay test pin atbreakout box. If relay clicks, relay is okay. If relay does not click, go to next step.

3) Check For Open Relay Wire To PCM Turn ignition off. With breakout box installed (PCM disconnected). Disconnect relay to be tested. Measure resistance between breakout box test pin of relay being tested and relay terminal to PCM at relay connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open wire between PCM and relay connector.

NOTE: When testing HFAN or HCFAN relays, both HFAN and HCFAN relays must be disconnected.

4) Check For Short In Relay Wire To PCM Turn ignition off. With breakout box installed and PCM disconnected, disconnect relay to be tested. Measure resistance between ground and breakout box test pin of relay being tested. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 or less, repair short to ground in wire between PCM and relay connector.

5) Check Power To Suspect Relay Turn ignition off. Disconnect relay to be tested. Turn ignition on. Measure voltage at PWR terminal at relay connector. If voltage is more than 10 volts, replace relay. If voltage is 10 volts or less, repair PWR wire.