The issues with the early ECM were the boards kept breaking and causing all those issues.
It may be you will need a new ECM instead of a re-manufactured one. They are still available with proms as well.
You could have a harness issue for this code. I attached information for you to follow.
The ECM supplies a voltage of about 0.55 volt between terminals "A16" and "A22". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The O2 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean.
The sensor is like an open circuit and produces no voltage when it is below 360 C (600 F). An open oxygen sensor circuit or cold oxygen sensor causes "Open Loop" operation.
Numbers below refer to step numbers on diagnostic chart.
1. DTC 13 will set under the following conditions:
Engine running for more than 2 minutes after start.
Engine coolant temperature at least 50 C (122 F).
No Code 21 or 22.
O2S signal voltage is steady between 0.35 and 0.55 volt.
Throttle position sensor signal indicates throttle opening greater than 4%.
All conditions must exist continuously for about 25 seconds.
2. This will determine if the sensor is at fault, or if the the wiring or ECM is the cause of the Code 13.
3. In doing this test use only a high impedance digital volt ohmmeter. This test checks the continuity of CKTs 412 and 413. If CKT 413 is open the ECM voltage on CKT 412 will be over 0.6 volt (600 mV).
An intermittent may be caused by a poor connection, worn through wire insulation, or a wire broken inside the insulation.
Poor Connection or Damaged Harness - Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
Intermittent Test - If connections and harness check OK, "Scan" 02 sensor voltage while moving related connectors and wiring harness, with warm engine running at part throttle in "Closed Loop." If the failure is induced "02 sensor voltage" reading will change from its normal fluctuating voltage (above 600 mV and below 300 mV) to a fixed value around 450 mV. This may help to isolate the malfunction.
Images (Click to enlarge)
Monday, November 5th, 2018 AT 3:50 AM