СИСТЕМА ECD, Diagnostic DTC:P2620, P2621, P2622

DTC Code	DTC Name
P2620	Throttle Position Output Circuit / Open
P2621	Throttle Position Output Circuit Low
P2622	Throttle Position Output Circuit High

DESCRIPTION

Refer to DTC P0122.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P2620

Throttle Position Output Circuit / Open

Open or short in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

Open or short in diesel throttle body assembly circuit
Diesel throttle body assembly
ECM

Does not come on

DTC stored

P2621

Throttle Position Output Circuit Low

Short to ground in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

Open or short in diesel throttle body assembly circuit
Diesel throttle body assembly
ECM

Does not come on

DTC stored

P2622

Throttle Position Output Circuit High

Short to +B in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

Open or short in diesel throttle body assembly circuit
Diesel throttle body assembly
ECM

Does not come on

DTC stored

WIRING DIAGRAM

Refer to DTC P0122.

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs registration and initialization.

Tech Tips

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.
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.

PROCEDURE

CHECK HARNESS AND CONNECTOR (DIESEL THROTTLE BODY ASSEMBLY - ECM)

Disconnect the diesel throttle body assembly connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
X7-4 (M+) - B220-50 (M+)	Always	Below 1 Ω
X7-5 (M-) - B220-20 (M-)	Always	Below 1 Ω
X7-4 (M+) or B220-50 (M+) - Body ground	Always	10 kΩ or higher
X7-5 (M-) or B220-20 (M-) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

OK

REPLACE DIESEL THROTTLE BODY ASSEMBLY

Replace the diesel throttle body assembly.

Result

Proceed to
NEXT

NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P2620, P2621 AND/OR P2622)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
Turn the ignition switch off and wait for 60 seconds or more [A].
Perform road test [B].
Repeat [A] and [B] for the number of trips detected.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

Read the DTC.

Result

Result	Proceed to
No DTC output	A
DTC P2620, P2621 and/or P2622	B

A

END

B

REPLACE ECM

Replace the ECM.

Result

Proceed to
NEXT

NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
Turn the ignition switch off and wait for 60 seconds or more [A].
Perform road test [B].
Repeat [A] and [B] for the number of trips detected.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

Confirm that the DTC is not output again.

Result

Proceed to
NEXT

NEXT

END

REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Result

Proceed to
NEXT

NEXT

GO TO STEP 5 Click here