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

Fig 1: 2.5L CFI Key Power Circuits

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 resistance between test pin No. 5 at the breakout box and pin No. 5 at the IRCM 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.

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.