8206code.fm Page 107 Tuesday, July 7, 1998 11:57 AM
DIAGNOSTIC CODE 4-1, 4-2 OR 4-3 Test 13 Checking the voltage on the MPH PLUS (+) line
1. Disconnect the J1B and J2 connectors from the V-MAC II module. 2. 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.
If there is a short, locate and repair the short in the harness. Retest to be sure the problem has been corrected. If there is no short, proceed to Test 40.
Test 24 Figure 166 — Voltage from Pin H3 to Ground
Checking the resistance in the harness
1. Turn the ignition key to the OFF position. 2. Disconnect the J1A and J1B connectors from the V-MAC II module. 3. Connect the serial link jumper into the serial communication port. 4. Measure the voltage from J1A connector pin H3 (the MPH sensor PLUS [+] line) to a good ground.
If the voltage is greater than zero volts, locate and repair the short to voltage in the harness. Retest to be sure the problem has been corrected.
Figure 168 — Resistance between Pins G3 and H3
1. Disconnect the jumper between harness connector pins A and B.
If the voltage is not greater than zero volts, proceed to Test 26.
2. Reconnect the sensor.
Test 20
3. Measure the resistance between J1A connector pins H3 (the MPH PLUS [+] line) and pin G3 (the MPH MINUS [−] line).
Checking for continuity in the harness
If the resistance is less than 500 ohms, proceed to Test 48. If there is no resistance, locate and repair the open in the sensor connector. Retest to be sure the problem has been corrected.
Figure 167 — Continuity between Pin H3 and All Other Pins
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