Test QE - Key Power Check
NOTE:
Perform this test only when a Code 55 is displayed in QUICK TEST.
NOTE:
This test is intended to diagnose only the following circuits or components:
- Harness circuit (KEY PWR)
- ECA
To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault:
- Charging system under voltage
- Battery charger connected with engine running
- Jump starting vehicle
- Code 55: Check Continuity of KEY PWR Circuit
Code 55 indicates KEY PWR circuit voltage is low. Possible causes for this fault are:
- KEY PWR circuit shorted to ground
- Faulty ECA
Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for corroded or damaged connector pins and repair as necessary. Install breakout box, leaving ECA disconnected. Disconnect the EEC-IV power relay or Integrated Relay Control Module (IRCM). Set DVOM on 200-ohm scale. Measure resistance between test pin No. 5 at the breakout box, and KEY PWR (KPWR) at the EEC-IV power relay vehicle harness connector. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open circuit, reconnect system components and rerun QUICK TEST PROCEDURES .
- Check KEY PWR Circuit For Short to Ground Turn key off, disconnect ECA and install breakout box. Disconnect power relay or IRCM. Set DVOM on 200-k/ohm scale and measure resistance between test pin No. 5 and test pins No. 40, 46, and 60, at the breakout box. If resistance is greater than 10 k/ohms, replace ECA, reconnect components and retest system. If resistance is less than 10 k/ohms, repair short circuit. Remove breakout box, reconnect all components and repeat QUICK TEST PROCEDURES .