8206code.fm Page 109 Tuesday, July 7, 1998 11:57 AM
DIAGNOSTIC CODE 4-1, 4-2 OR 4-3 Test 26
Test 40
Checking for continuity in the harness
Checking for a pin-to-pin short
Figure 171 — Continuity between Pin H3 and All Other Pins
Figure 172 — Continuity between Pin G3 and All Other Pins
1. Disconnect the serial link jumper. 2. Disconnect the J2 connector from the V-MAC II module. 3. Check for continuity between J1A connector pin H3 (the MPH sensor PLUS [+] line) and each of the other pins (one at a time) on the J1A, J1B and J2 connectors. 4. Check for continuity between J1A connector pin G3 (the MPH sensor MINUS [−] 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, repair the short in the harness between the pins which showed continuity. Retest to be sure the problem has been corrected.
Figure 173 — J1A, J1B and J2 Module Connectors
1. Visually inspect the V-MAC II module and module connectors for pin-to-pin shorts.
If there are any shorts, locate and repair the short at the V-MAC II connectors. Retest to be sure the problem has been corrected. If there are no repairable shorts, replace the V-MAC II module or connectors. Retest to be sure the problem has been corrected.
If there is no continuity, replace the V-MAC II module. Retest to be sure the problem has been corrected.
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