10C
DTC 23/83 (P1621): No ECM/Immobilizer Control Module Code Transmitted Malfunction
( DTC 23: No ECM/Immobilizer Control Module Code Transmitted from ECM or DLC Circuit Opened/Shorted )
( DTC 83 (P1621): No ECM/Immobilizer Control Module Code Transmitted from Immobilizer Control Module or DLC Circuit Opened/Shorted )
Wiring Diagram
1-1. Immobilizer Control Module (Vehicle not equipped with air bag system)
1-2. Immobilizer Control Module (Vehicle equipped with air bag system)
2. ECM
A. To data link connector (DLC)
NOTE:
Upper terminal number is for engine without VVT.
Lower terminal number is for engine with VVT.
System Description
When the ignition switch is ON, Immobilizer Control Module requests ECM and ECM requests Immobilizer Control Module to transmit ECM/Immobilizer Control Module code. If ECM/Immobilizer Control Module code is not transmitted from ECM or Immobilizer Control Module, Immobilizer Control Module sets DTC 23 and ECM sets DTC 83.
Troubleshooting
Step Action YES NO
1
1) Check voltage between Immobilizer Control Module coupler terminal shown below and body ground with ignition switch turned ON.
• Terminal of Immobilizer Control Module (1-1) for vehicle without air bag system: “G38-7”
• Terminal of Immobilizer Control Module (1-2) for vehicle with air bag system: “G38-2”
Is it 4 – 5 V?
Go to Step 2.
“YEL/BLK” wire short.
2
1) Disconnect ECM coupler with ignition switch turned OFF.
• Terminal of Immobilizer Control Module (1-1) for vehicle without air bag system: “G38-7”
• Terminal of Immobilizer Control Module (1-2) for vehicle with air bag system: “G38-2”
Is there continuity between Immobilizer Control Module coupler terminal shown below and serial data link terminal E114-2 (E118-10) of ECM coupler (A)? (For position of Data link connection terminal of ECM coupler, refer to Immobilizer Control System Introduction:M13A Model .)
<Vehicle without air bag system>
Poor “G38-7” terminal connection or poor data link connector terminal connection (ECM)
<Vehicle with air bag system>
Poor “G38-2” terminal connection or poor data link connector terminal connection (ECM)
If connection are OK, substitute a known-good ECM or Immobilizer Control Module and recheck. See NOTE.
“YEL/BLK” wire between Immobilizer Control Module and ECM open.
NOTE:
• After replacing with a known-good ECM, register ECM/Immobilizer Control Module code in ECM by performing procedure described in Procedure after Immobilizer Control Module Replacement:M13A Model .
• After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobilizer Control Module by performing procedure described in Procedure after Immobilizer Control Module Replacement:M13A Model .