AUTOMATIC TRANSMISSION (4 A/T) 7B-47
DTC P1709 Engine coolant temperature/barometric pressure signal circuit
1. ECM 3. TCM couplers (viewed from harness side)
2. TCM 4. ECM couplers (viewed from harness side)
DTC DETECTING CONDITION
• Engine coolant temperature/barometric pressure signal voltage too low although A/T fluid temperature is
normal operating temperature and engine revolution is standard.
Step Action Yes No
1 Check DTC referring to “ENGINE DIAGNOSIS”
in Section 6.
Is any DTC detected?
Inspect and repair refer-
ring to DTC flow table in
Section 6.
Go to Step 2.
2 1) Turn ignition switch OFF and disconnect
TCM and ECM couplers.
2) Check continuity between terminal “E13-18”
of disconnected harness side TCM coupler
and body ground.
Is continuity indicated?
“Gr” wire shorted to
ground.
Go to Step 3.
3 Check continuity between terminals “E13-18”
and “E21-5” of disconnected harness side cou-
plers.
Is continuity indicated?
Go to Step 4. “Gr” wire open.
4 1) Connect TCM couplers.
2) Turn ignition switch ON and check voltage
between terminal “E13-18” and body
ground.
Is it 0 V?
Substitute a known-good
TCM and recheck.
Substitute a know-good
ECM and recheck.
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