Scan Tool Does Not Communicate W/Class 2 Data Line - GMC Chevrolet Camaro 1998 Service Manual

Body and Accessories
Wiring Systems 8~381
Scan Tool Does Not Communicate w/Class 2 Data Line
Step Action
Value(s)
Yes No
Use a DMM in order to measure the voltage between B+
)
1
and DLC terminal 5.
B+ (9-14 V)
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Inspect for a proper connection of the scan tool to
2
the DLC.
-
Is the connection OK between the scan tool and the DLC?
Go to Step 6 Go to Step 7,
3
Does the instrument cluster display work?
-
Go to Step 4 Go to Step 5
Repair the poor connection or open in circuit 451 between
4
the DLC and S215.
-
-
Has the repair been made? Go to Step 17
Repair the poor connection or open in circuit 451 between
5
S215 and G110.
-
-
Has the repair been made? Go to Step 17
Use the scan tool in order to establish communication with
6
the PCM on a different vehicle.
-
Can communication be established with the scan tool? Go to Step 8 Go to Step 9
Repair the poor connection between the DLC and the
7
scan tool. -
-
Is the repair complete?
Go to Step 17
1. Reconnect the scan tool to the DLC.
2. Turn the ignition switch to RUN.
8
3. Use a scan tool in order to establish communication
-
with the Powertrain Control Module (PCM).
Can the scan tool communicate with the PCM?
Go to Step 10 Go to Step 11
Determine if the scan tool is malfunctioning.
)
9
Refer to the scan tool instruction manual for additional
-
-
information.
Is the action complete?
Go to Step 17
1. If malfunction is not present or intermittent, inspect
the PCM connector for a poor connection, short
10
to B+, or short to ground in CKT 1807.
-
-
2. Repair as necessary.
Is the action complete? Go to Step 17
1. Turn the ignition switch to the OFF position.
2. Disconnect the PCM connector C1 (V6 VIN K) or
11
C2 (VB VIN G).
Infinite
3. Use a DMM in order to measure the resistance
between the DLC terminal 2 and the DLC terminal 5.
Is the resistance the same as the specified value?
Go to Step 12 Go to Step 13
1. Turn the ignition switch to RUN.
12
2. Use a DMM in order to measure the voltage between
1 V
the DLC terminal 2 and the DLC connector terminal 5.
Is the voltage less than the specified value?
Go to Step 14 Go to Step 15
13
Repair the short to ground in CKT 1807.
- -
Is the repair complete?
Go to Step 17
Check continuity in circuit 1807 between the DLC
14
terminal 2 and the PCM connector C1 terminal 59
(V6 VIN K) or connector C2 terminal 58 (VB VIN G).
-
Is there continuity?
Refer to PCM Go to Step 16
)