Test TC-32A - Low Speed Fan Control Circuit (DTC 35)
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
- Using scan tool, erase DTCs. Using scan tool, actuate low speed radiator fan relay. If low speed radiator fan relay is not clicking, go to step 5). If low speed radiator fan relay is clicking, go to next step.
- Condition required to set DTC is not present at this time. The LOW SPEED FAN CONTROL RELAY CIRCUIT DTC sets if low speed radiator fan relay control circuit (Dark Blue/Pink wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in low speed radiator fan relay coil windings, open or short in low speed radiator fan relay control circuit (Dark Blue/Pink wire), open or short in low speed radiator fan relay ignition feed circuit (Dark Blue/White wire) or failed driver in PCM. Go to next step.
- Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, go to next step.
- While still actuating low speed radiator fan relay, wiggle wiring harness from radiator fan relay to PCM. Stop actuation of low speed radiator fan relay. Using scan tool, read DTCs. If LOW SPEED FAN CONTROL RELAY CIRCUIT DTC returned, repair wiring harness as necessary. Perform TEST VER-2. If LOW SPEED FAN CONTROL RELAY CIRCUIT DTC did not return, system is now functioning properly. Perform TEST VER-2.
- Remove low speed radiator fan relay. Install a known-good low speed radiator fan relay. If known-good low speed radiator fan relay is clicking, replace original low speed radiator fan relay. Perform TEST VER-2. If known-good low speed radiator fan relay is not clicking, remove known-good low speed radiator fan relay. Put scan tool in voltmeter mode.
- Using scan tool, check voltage on low speed radiator fan relay connector, ignition feed circuit (Dark Blue/White wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2.
- If voltage is more than 10 volts, using an external ohmmeter, check resistance between low speed radiator fan relay terminals. See Fig 1 . If resistance is more than 100 ohms, replace low speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
- Turn ignition off. Disconnect Powertrain Control Module (PCM). Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance of low speed radiator fan relay connector, control circuit (Dark Blue/Pink wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire. Perform TEST VER-2.
- If resistance is more than 5 ohms, using an external ohmmeter, check resistance of control circuit (Dark Blue/Pink wire) between radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.