3.
Is the problem found?
▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
▶ Go to "Signal Circuit Inspection".
When a driver turns on IG KEY, IG KEY ON signal is inputted to ECM connector(C244-K) terminal 28 through IG KEY switch. This signal initializes(boots) ECM accordingly, main relay operates. Main relay supplies powers for ECM, sensors and actuators in order to enable engine to start.When IG KEY ON signal is shut off during turning engine OFF, ECM stops injector operation then engine turns OFF. Approx. after 16 sec., ECM shuts OFF main relay and system turns OFF.
When the condition that IG KEY ON signal turns OFF while ECM, to which IG signal inputted, is initialized (booting, Approx. 25ms is required), IG KEY switch error is recognized and P1652 is set (monitored only once every IG KEY ON initialization process). This code is due to poor connection in IG KEY ON signal circuit.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Voltage monitoring | ● IG KEY "ON"signal circuit ● IG KEY switch | ||
Enable Conditions | ● Engine running | |||
Threshold Value | ● No signal through IG line after IG KEY "ON" | |||
Diagnostic Time | ● Immediately | |||
Fail Safe | Fuel cut | NO | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | NO | |||
Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.
Perform checking procedure as follows.
Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.
Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.
Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )
Is the problem found?
▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
▶ Go to "Signal Circuit Inspection".
IG KEY "OFF", ENGINE "OFF"
Connect Oscilloscope to ECM connector(C244-K) terminal 28 with ECM connector being connected.
Check IG KEY "ON" signal waveform at IG KEY "ON".
specification : The signals indicate poor connection should not exist at IG KEY "ON" range.
Does abnormal waveform generate at IG KEY "ON" range?
▶ Repair IG KEY S/W and poor connection of E/R JUNCTION BOX 10A ECU FUSE, JC01 joint connector terminal 90 and related circuit and go to "Verification of Vehicle Repair".
▶ Go to "Verification of Vehicle Repair".
※ Repeat this process 2~3 times.
After a repair, it is essential to verify that the fault is corrected.
After connecting Scantool select "DIAGNOSTIC TROUBLE CODES(DTCs)" mode.
Clear recorded DTC using Scantool.
Drive the vehicle within DTC "Enable conditions" in "General information".
After selecting "DIAGNOSTIC TROUBLE CODES(DTCs)" mode and check if DTC is recorded again.
Are any DTCs recorded ?
▶ Go to the DTC guide of recorded NO. in Scantool.
▶ System operates within specification.
