DTC P0615 (K20C2: With Keyless Access System)
DTC P0615: Starter Cut Relay Diagnosis Circuit Malfunction
General Description
The starter control system prevents the starter from accidentally activating when the shift position is not in P or N position/mode (CVT) or the clutch pedal is released (M/T), or when the engine is running. If the vehicle is turned mistakenly while shift position is not in P or N position/mode (CVT) or the clutch pedal is released (M/T) or while the engine is running, the powertrain control module (PCM) will stop power to the starter cut relay circuits. However, cranking to return from auto idle stop does not correspond to this (if equipped). In this system, two starter cut relay circuits are connected in series (starter cut relay 1 circuit, starter cut relay 2 circuit) to prevent the starter from running continuously due to a starter cut relay circuit malfunction. Also a diagnosis line (ST RLY 1 TO 2) is connected to monitor the voltage between the starter cut relay 1 circuit and starter cut relay 2 circuit. Based on the diagnosis line signals, the PCM detects an OPEN malfunction of diagnosis line, an ON malfunction of starter cut relay 1 circuit, and an ON malfunction of starter cut relay 2 circuit. The PCM also equips with return signal circuits of starter cut relay 1 circuit and starter cut relay 2 circuit to detect an OFF malfunction. If the voltage of the diagnosis line (ST RLY 1 TO 2) input does not exceed the upper and lower limits for a specified duration when the starter is ON (STS ON), the PCM detects an OPEN malfunction of the diagnosis line and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 0.3 second or more |
| DTC Type | Two drive cycles, MIL off |
Enable Conditions
| Condition | |
|---|---|
| Starter | ON |
Malfunction Threshold
The diagnosis line (ST RLY 1 TO 2) input voltage [STARTER CUT RELAY] is between 2.4 V to 2.6 V for at least 0.3 second.
[ ]: HDS Parameter
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Starter cut relay circuit ST RLY 1 TO 2 line open
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.