System Testing: Notes
WARNING: This page is about a different car, the 1997 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Deactivate air bag system before performing any service operation involving steering column components. Refer to the AIR BAG RESTRAINT SYSTEM article. DO NOT
apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See the COMPUTER RELEARN PROCEDURES
article in the GENERAL INFORMATION section before disconnecting battery.
Before performing any tests on wiper/washer system, check the following items to eliminate common problems:
- Wiper/washer related fuses.
- Damaged/stripped wiper motor shaft.
- Damaged/stripped wiper pivot arm shaft.
- Damaged washer pump.
- Loose or corroded connections.
- Damaged wiring harness.
- Binding windshield wiper pivot arm.
- Inoperative multifunction switch.
- Speed dependent feature deactivated.
For testing wiper/washer system, a New Generation Star (NGS) tester is required. Refer to DIAGNOSTIC TEST INDEX TABLE, then go to the appropriate PINPOINT TEST. For individual component testing, see COMPONENT TESTS .
DIAGNOSTIC TEST INDEX
| Symptom | Test |
|---|---|
| Windshield Washer Inoperative | A |
| Wipers Inoperative | B |
| No Wiper High Speed | C |
| No Wiper Low Speed | D |
| Wipers Work At Only One INT Setting | E |
| Wipers Run With Switch Off | F |
| Front & Rear Wipers Inoperative | G |
| Wipers Work With Key Out | H |
| Washer Inoperative (No Interval Delay) | J |
| Wiper Intervals Not Properly Altered By Vehicle Speed | K |