Cranking Holding Function Circuit

DESCRIPTION

w/ Entry and Start System

While the engine is being cranked, the ECM receives the STA signal from the certification ECU (smart key ECU assembly), and then the ECM performs starting based on its signal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. 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 intelligent tester display.
This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to Problem Symptoms Table Click here.

PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

Check the value displayed on the intelligent tester when the ignition switch is turned to the ON and START positions.

OK

Ignition Switch Position	Starter Signal
ON	OFF
START	ON

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

NG

CHECK HARNESS AND CONNECTOR (ECM - STARTER RELAY ASSEMBLY HOLDER)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A59-6 (STA) - 2 (Starter relay holder)	Always	Below 1 Ω

OK

REPLACE ECM Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

ECD SYSTEM(w/ DPF) Cranking Holding Function Circuit