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Test No. 1: Scan Tool Communication Not Possible

  1. Check if scan tool can communicate with Engine Control Module/Powertrain Control Module (ECM/PCM). If scan tool cannot communicate with ECM/PCM, diagnose communication problem. See SELF-DIAGNOSTICS - ECLIPSE article in ENGINE PERFORMANCE. If scan tool will communicate with ECM/PCM, check if ECM/PCM DTCs other than P1610 reset. If DTC other than P1610 reset, diagnose DTC. See SELF-DIAGNOSTICS - ECLIPSE article in ENGINE PERFORMANCE. If no ECM/PCM DTCs other than DTC P1610 reset, go to next step.
  2. Disconnect immobilizer-ECU 12-pin connector. Turn ignition on. Measure voltage between ground and immobilizer-ECU connector terminal No. 7 (Red wire). If battery voltage exists, go to step  4 . If battery voltage does not exist, go to next step.
  3. Check immobilizer-ECU and MFI relay connectors for loose, damaged or corroded terminals. Check for open or short to ground in Red wire between MFI relay connector terminal No. 1 and immobilizer-ECU connector terminal No. 7. See Fig 1 and Fig 2 . Repair connector(s) or Red wire as necessary.
  4. Turn ignition off. Measure resistance between ground and immobilizer-ECU connector terminal No. 3 (Black wire). If resistance is less than 2 ohms, go to next step. If resistance is 2 ohms or more, go to step  6 .
  5. Check immobilizer-ECU connector for loose, damaged or corroded terminals. Check for open in Black wire between immobilizer-ECU and ground. Repair connector or Black wire as necessary.
  6. Check for open or short in White/Green wire between indicated immobilizer-ECU and ECM/PCM terminals. See IMMOBILIZER-ECU-TO-ECM/PCM CIRCUIT TERMINAL IDENTIFICATION  table. See Fig 3 -Fig 5 . If problem exists, repair White/Green wire as necessary. If problem does not exist, replace immobilizer-ECU and go to next step.
    CAUTION: DO NOT register immobilizer-ECU at this stage, otherwise immobilizer-ECU must be replaced with a new one if ECM/PCM is replaced due to malfunction.
  7. Check for scan tool communication with immobilizer-ECU. If scan tool can communicate with immobilizer-ECU, register password and ignition key encrypted code. See PROGRAMMING  . If scan tool cannot communicate with immobilizer-ECU, replace ECM/PCM and ignition key. Register password and ignition key encrypted code.
IMMOBILIZER-ECU-TO-ECM/PCM CIRCUIT TERMINAL IDENTIFICATION

Application Immobilizer-ECU Connector Terminal No. ECM/PCM Connector (Terminal No.)
2.4L
M/T 5 C-56 (51)
A/T 5 C-61 (111)
3.0L
M/T 5 C-62 (98)
A/T 5 C-63 (111)
Fig 1: Locating MFI Relay
G00023328Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 2: Identifying MFI Relay Connector Terminals
G00005858Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 3: Identifying ECM Connector C-56 Terminals (2.4L M/T)
G00023332Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 4: Identifying ECM Connector C-62 Terminals (3.0L M/T)
G00023336Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 5: Identifying PCM Connector C-61 & PCM Connector C-63 Terminals (2.4L A/T & 3.0L A/T)
G00023340Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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