Dtc P1670 Injection Pump Control Module Rom Test Error
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (ECM - INJECTION PUMP CORRECTION UNIT)
REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY
READ OUTPUT DTC (DTC P1670 IS OUTPUT AGAIN)
DTC P1670 Injection Pump Control Module ROM Test Error |
DESCRIPTION
To compensate for the change in injection volume and injection timing caused by the variance in the injection or supply pump assembly itself, a correction is made by using the data that is stored in the ROM in the injection pump correction unit.DTC No.
| DTC Detection Condition
| Trouble Area
|
P1670
| When the ignition switch was turned ON, or when the ECM determines whether it is an error of RAM in ECM or not, the ECM conducts a single communication. If any one of the following status occurs in the communication, the ECM conducts one more communication. While the ECM is conducting the communication, if (a) is duplicated 20 times continuously, or if (b) is duplicated 20 times continuously, or if (c) is duplicated 2 times continuously, the ECM outputs the DTC P1670.
(a) There was a communication error when receiving data.
(b) Data sent from the injection pump correction unit does not match to the data received from the ECM.
(c) Data received from the pump ROM is not input in the period of 1024 msecond.
Although the determining process is completed without a problem, the ECM conducts the communication again if an undefined code is found while checking an identification code of the receiving data. If the undefined code was duplicated 20 times in a row, the ECM outputs the DTC.
| - Open or short in injection or supply pump assembly correction unit circuit
- Injection pump correction unit (Injection or supply pump assembly)
- ECM
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
| 1.CHECK HARNESS AND CONNECTOR (ECM - INJECTION PUMP CORRECTION UNIT) |
Disconnect the injection pump correction unit connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
C107-1 (DATA) - C161-29 (DATA)
| Always
| Below 1 Ω
|
C107-4 (CLK) - C161-28 (CLK)
| Always
| Below 1 Ω
|
C107-1 (DATA) or C161-29 (DATA) - Body ground
| Always
| 10 kΩ or higher
|
C107-4 (CLK) or C161-28 (CLK) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 2.REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY |
Replace the injection or supply pump assembly (LandCruiser RM0000010YN00KX.html).
| 3.READ OUTPUT DTC (DTC P1670 IS OUTPUT AGAIN) |
Clear the DTC (LandCruiser RM000000VR600WX.html).
Turn the ignition switch to ON.
Check the DTC (LandCruiser RM000000VR600WX.html).
- Result:
Display (DTC output)
| Proceed to
|
DTC P1670 is output again
| A
|
No DTC output
| B
|
