GSIC - Global Service Information Center

### DTC P1601/89 Injector Compensation Code

## for Preparation Click here

NOTICE:

1. When an injector is replaced, the injector's compensation code must be input into the ECM. When the ECM is replaced, all of the existing injector compensation codes must be input into the new ECM.
2. Injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each injector. If an incorrect injector compensation code is input into the ECM, the engine may rattle or engine idling may become rough. In addition, engine failure may occur and the life of the engine may be shortened.

When replacing the ECM with a new one, input all the injector's compensation codes into the new ECM as follows:

1. Prior to replacing the ECM, use the intelligent tester to read and save each injector's compensation code from the original ECM (Click here).

2. After installing a new ECM, input the saved compensation codes into the new ECM using the tester (Click here).

3. Turn the ignition switch OFF and then turn the intelligent tester OFF.

4. Wait for at least 30 seconds.

5. Turn the ignition switch ON and then turn the tester ON.

6. Clear DTC P1601/89 stored in the ECM using the tester (Click here).

   HINT:
   1. Each injector has different fuel injection characteristics. In order to optimize the fuel injections, the ECM uses the compensation codes to balance the different fuel injections between each injector.
   2. When you first turn the ignition switch ON after replacing the ECM or an injector(s), DTC P1601/89 is set. This is to inform you that an injector compensation code(s) must be registered. Manually clear the DTC upon completion of the compensation code registration.

## DESCRIPTION

DTC No. | DTC Detection Condition | Trouble Area

P1601/89

1. Injector compensation code is not registered
   (1 trip detection logic)
2. Wrong injector compensation code is registered
   (1 trip detection logic)

1. Injector compensation code
2. ECM

## INSPECTION PROCEDURE

HINT:

  Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

NOTICE:

  If the ECM is replaced, the new ECM needs initialization (Click here).

1.CHECK INJECTOR COMPENSATION CODE

OK:
  Compensation codes stored in ECM match compensation codes of installed injectors.

| NG |

REGISTER INJECTOR COMPENSATION CODE

OK |

REPLACE ECM