Transfer Pump Fuel Volume Check
- Turn ignition off. To check transfer pump (in tank), remove rear seat. Remove fuel sending unit access cover. Disconnect ignition coil secondary wire and jumper to ground. With transmission in neutral, crank engine for a 3-4 seconds. While the starter is turning and for a few seconds afterwards, an audible sound should be heard at the pump. If not, proceed to step 2).
- Activate fuel pumps by removing fuel pump relay and attaching jumper wire between terminals No. 30 battery voltage and No. 87 output to fuel pumps. Terminal identification is molded on fuse/relay panel. If pump does not operate, remove transfer pump wiring harness connector. See Fig 1 .
- Using test light, check for voltage between Brown (-) and Green (+) wire at connector. If voltage is present, replace transfer pump. If not, repair open or short circuit in wiring.
- If transfer pump operates correctly, remove fuel pump relay jumper wire. Disconnect and plug transfer pump output hose. Attach a hose to pump outlet connector and place other end of hose in a graduated container. Activate fuel pump for 10 seconds.
- Minimum fuel flow for CIS-E should be 13.5 ounces (.4 liters). Minimum fuel flow for CIS-Motronic and AFC-Digifant II should be 10.0 ounces (.3 liters). If fuel flow is low, check fuel tank filter for restriction. If okay, replace transfer pump.
NOTE:
Before testing main fuel pump, check transfer pump. See TRANSFER PUMP FUEL VOLUME CHECK in this article.