DTC P0852 Neutral Switch Input Circuit High (Mt Model)

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.
GENERAL DESCRIPTION < Ref. to DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling

CAUTION: After repairing or replacing the defective part, perform the Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Neutral Switch Input Circuit High (MT Model) - Wiring Diagram

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Place the shift lever in neutral. Measure the voltage between ECM and chassis ground. Connector & terminal (B136) No. 31 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Go to step 2.	Go to step 4 .
2 CHECK INPUT SIGNAL OF ECM. Place the shift lever except in neutral. Measure the voltage between ECM and chassis ground. Connector & terminal (B136) No. 31 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 3.	Go to step 5 .
3 CHECK POOR CONTACT. Check poor contact of ECM connector.	Is there poor contact in ECM connector?	Repair the poor contact of ECM connector.	Contact the SOA service center.
4 CHECK NEUTRAL SWITCH. Place the shift lever except in neutral. Measure the resistance between transmission harness connector terminals. Connector & terminal (T2) No. 1 - No. 2:	Is the resistance less than 1 Ω?	Go to step 5.	Repair the open circuit in transmission harness or replace neutral switch.
5 CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR. Disconnect the connector from ECM. Measure the resistance of harness between ECM and transmission harness connector. Connector & terminal (B136) No. 31 - (B25) No. 1: (B136) No. 6 - (B25) No. 2:	Is the resistance less than 1 Ω?	Go to step 6.	Repair open circuit of harness between ECM and transmission harness connector.
6 CHECK HARNESS BETWEEN ECM AND NEUTRAL SWITCH CONNECTOR. Measure the resistance of harness between transmission harness connector and engine ground. Connector & terminal (B25) No. 2 - Engine ground:	Is the resistance less than 5 Ω?	Go to step 7.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between transmission harness connector and engine ground Poor contact in coupling connector
7 CHECK POOR CONTACT. Check poor contact of transmission harness connector.	Is there a poor contact in the transmission harness connector?	Repair the poor contact in transmission harness connector.	Contact the SOA service center.