8206noco.fm Page 181 Thursday, July 2, 1998 1:19 PM
SYMPTOM RELATED DIAGNOSTICS LOW COOLANT LEVEL (continued) Test 5
1. Turn the ignition key to the OFF position.
Checking for voltage to the probe
2. Disconnect the J1A connector from the V-MAC II module. 3. Check for continuity from J1A connector pin F3 (the coolant level signal [+] line) to a good ground.
If there is continuity, locate and repair the short to ground in the wiring harness or connector. Retest to be sure the problem has been corrected. If there is no continuity, proceed to Test 22. Figure 299 — Voltage from Pin A to Ground
1. Turn the ignition key to the OFF position.
Test 22
2. Disconnect the harness from the coolant level sensor.
Checking for a pin-to-pin short in the harness
3. Turn the ignition key to the ON position. 4. Measure the voltage from pin A, on the harness end of the probe connector, to a good ground.
If the voltage is greater than 4 volts, replace the V-MAC II module. Retest to be sure the problem has been corrected. If the voltage is less than 4 volts, proceed to Test 11.
Test 11 Checking for a short to ground
Figure 301 — Continuity between Pin F3 and All Other Pins
1. Disconnect the J1B and J2 connectors from the V-MAC II module. 2. Check for continuity between J1A connector pin F3 (the coolant level signal [+] line) and each of the other pins (one at a time) on the J1A, J1B and J2 connectors.
If there is continuity with another pin, locate and repair the short in the wiring harness or connector. Retest to be sure the problem has been corrected.
Figure 300 — Continuity from Pin F3 to Ground
If there is no continuity, visually inspect the J1A connector for dirt, corrosion, or foreign matter around pin F3. If no problem is found, replace the V-MAC II module. Retest to be sure the problem has been corrected.
Page 181
