Dtc P2144 - Mazda 6 Workshop Manual

DTC P2144

DTC P2144 EGR control solenoid valve control circuit low input
• The PCM monitors the output signal to the EGR control solenoid valve. If the EGR control solenoid valve
voltage is low even if the EGR control solenoid valve is off, the PCM determines that there is a malfunction
in the EGR control solenoid valve control system.
Diagnostic support note
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or
DETECTION
CONDITION
in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive
cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• EGR control solenoid valve malfunction
• Open circuit in wiring harness between PCM control relay terminal C and EGR control solenoid valve
terminal A
• Open circuit in wiring harness between EGR control solenoid valve terminal B and PCM terminal 77
POSSIBLE
• Short to ground circuit in wiring harness between EGR control solenoid valve terminal B and PCM terminal
CAUSE
77
• Connector or terminal malfunction
• PCM malfunction
PCM CONTROL RELAY
TERMINAL C
PCM CONTROL
RELAY WIRING
EGR CONTROL
HARNESS-SIDE
SOLENOID
CONNECTOR
VALVE WIRING
HARNESS-SIDE
A E
CONNECTOR
C
B
D
ON-BOARD DIAGNOSTIC
EGR CONTROL
SOLENOID VALVE
7
4
5
A
26 25 24 23
52 51 50
A
78 77 76 75
104 103 102 101
4
6 9
B
PCM
WIRING HARNESS-SIDE
CONNECTOR
22 21 20 19 18 17 16 15 14
49 48 47 46 45 44 43 42 41 40
74 73 72 71 70 69 68 67 66
100 99 98 97 96 95 94 93 92
B6E407002100105
PCM
77
13 12 11 10 9 8 7 6 5 4
39 38 37 36 35 34 33 32 31 30
65 64 63 62 61 60 59 58 57 56 55
91 90 89 88 87 86 85 84 83 82
F2–187
F2
3 2 1
29 28 27
54 53
81 80 79