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

1) 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 the following resistances:

2) 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.