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Communication Error

If scan tool will not communicate with PCM (no response on scan tool) or will not respond to a particular request, a communication error exists. Scan tool may display a 2-digit code indicating a communication error (e.g., Code 10). These codes are communication status codes, not DTCs. Some status codes indicate normal communication function. See COMMUNICATION CODES  table. If scan tool indicates a communication error with or without a status code, refer to SCAN TOOL COMMUNICATION ERROR TEST IDENTIFICATION  table for appropriate diagnostic procedure. If scan tool displays a communication pass code (Code 62) after performing QUICK TEST, go to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - VILLAGER article.

COMMUNICATION CODES

Code Description
00 General Affirmative - PCM Received A Valid Request From Scan Tool
10 General Reject - PCM Will Not Respond To Request
11 Mode Not Supported - PCM Not Capable Of Performing A Requested Test
12 Invalid Data Format - An Unrecognized Character Is Inserted Into A String Of Data
21 PCM Is Busy At Time Of Request - PCM Is Already Performing A Test At Time Another Test Is Being Requested
22 Entry Conditions Not Correct - Usually Operator Error (Engine Not Running When KOER Is Requested.)
23 Results Requested Before Completion Of Test - Request Received, But PCM Is Not Ready To Respond
50 Upload Not Accepted - Request Cannot Be Accomplished Due To A Fault Condition
61 Normal Exit With Results - PCM Completed A Valid Request (Test) & DTC Was Recorded
62 Normal Exit, No Results - PCM Completed A Valid Request & No DTC Recorded
63 Abnormal Exit With Results - While PCM Is Performing Test, Error Occurred, But PCM Has Results (DTCs)
64 Abnormal Exit Without Results - While PCM Is Performing Test, Error Occurred And No Results Are Available
SCAN TOOL COMMUNICATION ERROR TEST IDENTIFICATION

Fault Go To Test QA, Step
OBD-II Communication Error (1)  1)
No PCM Data Through Diagnostic Connector  10)
No TCM Data Through Diagnostic Connector  20)
(1) Only applies when DIAGNOSTIC DATA LINK menu is functional on scan tool.
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