P1820

P1820 Engine Speed Signal

Description

The ECM transmits the engine speed signal via CAN communication to the transfer control unit. DTC P1820 will set when either of the following occur:

- Malfunction is detected in engine speed signal that is output from the ECM.
- Improper signal is input while driving.

DTC Logic

DTC Detection Logic






DTC Confirmation Procedure

1. DTC CONFIRMATION PROCEDURE

1 Turn ignition switch ON.
2 Perform "DTC check".

Is DTC P1820 detected?
YES
Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO
Inspection End.

Diagnosis Procedure

1. CHECK DTC WITH ECM

Perform "DTC check" with ECM. Refer to [SDT Function] SDT Function.

Is any malfunction detected by "DTC check"?
YES
Check the malfunctioning system.
NO
GO TO 2.

2. CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to [Transfer Control Unit: Reference Value] .

Are the inspection results normal?
YES
GO TO 3.
NO
Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

3. CHECK DTC

Perform the "DTC check", after driving a vehicle for a while.

Is DTC P1820 displayed?
YES
Perform "DTC check" with ECM again.
NO
Inspection End.