DESCRIPTION
While the engine is being cranked, positive battery voltage is applied to terminal STA of the ECM.
If the ECM detects the starter control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL and sets the DTC.
This monitor runs when the vehicle has been driven at 20 km/h (12.4 mph) for more than 20 seconds.
| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
|---|---|---|
| Drive the vehicle for 25 seconds or more at a speed of 20 km/h (12.5 mph) or more and an engine speed of 1000 rpm or more | When conditions (a), (b) and (c) are met, positive (+B) battery voltage of 21 V or more is applied to ECM for 20 seconds (1 trip detection logic): (a) Vehicle speed is more than 20 km/h (12.4 mph) (b) Engine speed is more than 1000 rpm (c) STA signal is ON |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
After replacing the ECM, the new ECM needs registration Click here and initialization Click here.
Tech Tips
The following troubleshooting flowchart is based on the premise that the engine is cranked normally. If the engine does not crank, proceed to the problem symptoms table Click here.
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.
PROCEDURE
READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)
Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.
Note
Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
Check the value displayed on the tester when the ignition switch is turned to the ON and START position.
| OK | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
INSPECT IGNITION SWITCH ASSEMBLY Click here |
| OK |
|
CHECK FOR INTERMITTENT PROBLEMS Click here
INSPECT IGNITION SWITCH ASSEMBLY
Inspect the ignition switch assembly Click here.
| NG |
|
REPLACE IGNITION SWITCH ASSEMBLY |
| OK |
|
CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM)
Disconnect the ECM connector.
Remove the starter cut (ST CUT) relay.
Disconnect the ignition switch assembly connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Reconnect the ECM connector.
Reinstall the starter cut (ST CUT) relay.
Reconnect the ignition switch assembly connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STARTER CUT (ST CUT) RELAY, IGNITION SWITCH ASSEMBLY) |
| OK |
|
REPLACE ECM Click here