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DTC P1510 ECM BACK-UP POWER SUPPLY MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
[A] : Case of TYPE A is shown (See NOTE)
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM,
etc. are kept in ECM even when the ignition switch is turned OFF.
NOTE:
For TYPE A and TYPE B, refer to NOTE in "ECM VOLTAGE VALUES TABLE" for applicable model.
DTC DETECTING CONDITION
• Low voltage at terminal G02-17 (Case of TYPE A.
See NOTE) or C41-7 (Case of TYPE B. See NOTE)
after starting engine.
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and run it at idle for 1 min.
2) Select "DTC" mode on scan tool and check DTC.
INSPECTION
Step
1
Check Terminal Voltage.
1) Check for voltage at terminal G02-17 (Case
of TYPE A. See NOTE) or C41-7 (Case of
TYPE B. See NOTE) of ECM connector
connected, under each condition, ignition
switch OFF and engine running.
Is it 10 – 14 V at each condition?
ECM
G02-17 [A]
C41-7 [B]
C42 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
[B] : Case of TYPE B is shown (See NOTE)
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-111
WHT/RED
C41 (24P)
7
6
5
4
3
2
1
6
16
15
14
13 12
11
10
9
8
12
24
23
22
21
20
19
18
17
17
• "WHT/RED" circuit open
• ECM malfunction
Yes
Poor G02-17 (Case of
TYPE A. See NOTE) or
C41-7 (Case of TYPE B.
See NOTE) connection or
intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
If wire and connections
are OK, substitute a
known- good ECM and
recheck.
G02 (17P)
5
4
3
2
1
11
10
9
8
7
16
15
14
13
POSSIBLE CAUSE
No
"WHT/RED" circuit open.
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