To enhance usage of ECM, no matter whether ESP is installed or not, ECM is programmed two map to control fuel amount. one is for ESP, another is for non ESP. ECM automatically recognize and set which option ESP or Non ESP is with wire connection exactly as same as A/T, M/T recognition. ECM judge that ESP is installed by means that "ESP auto recognition" terminal is ground. However, if it is open ECM recognize it as ESP is not installed. (It is done every IG key ON)
?With ESP?There is ground wire in "ESP auto recognition" terminal of ECM harness connector. (Ground)
?Without ESP?There is ground wire in "ESP auto recognition" terminal of ECM harness connector. (Non Ground)
P1815 is set when the signal from "ESP auto recognition" terminal changes during engine running. This code is due to open in terminal for ESP option, grounded condition for Non ESP option. This code is normally arises from ESP option vehicle. Check the grounding condition of "ESP auto recognition" terminal.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage monitoring
? ESP auto recognition circuit
? ECM component failure
Enable Conditions
? Engine running
Threshold Value
? ESP auto recognition signal changes at engine ON.
Diagnostic Time
? 0.6 sec.
Fail Safe
Fuel cut
NO
? Glow Lamp blinks.
EGR Off
Fuel Limit
Check Lamp
OFF