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3. O2 SENSOR Measure the voltage on the (K902) O2 Upstream Return circuit in the Is the voltage at 2.5 volts? Yes >> Replace the 2/1 O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 4 4. (K902) O2 UPSTREAM RETURN CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K902) O2 Upstream Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (K902) O2 Upstream Return circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 8 5. (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 and C2 PCM harness connectors. Measure the resistance between ground and the (K43) O2 2/1 Signal Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (K43) O2 2/1 Signal cir- cuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 6 9 - 154 ENGINE ELECTRICAL DIAGNOSTICS KJ |