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DI-174
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTJ-01
DTC P0230 Fuel Pump Primary Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal STAR of the ECM to the starter
relay coil and also current flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, the Tr1 is turned ON, current flows to the coil of
the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and the fuel pump oper-
ates.
While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (circuit opening relay ON)
and the fuel pump also keeps operating.
The fuel pump speed is controlled at two levels (high speed or low speed) by the condition of the engine
(starting, light load, heavy load). When the engine starts (STA ON), the Tr2 in the ECM is OFF, so the fuel
pump relay closes and battery positive voltage is applied directly to the fuel pump. The fuel pump operates
at high speed.
After the engine starts while idling or light loads, since the Tr2 goes ON, power is supplied to the fuel pump
via the fuel pump resistor. The fuel pump operates at low speed.
EFI Relay
ECM
EFI No.1
MREL
Fuel Pump Resistor
Circuit Opening
Relay
Fuel Pump Relay
FPR Tr2
IGN
Ignition Switch
AM2 Fuel Pump
Starter Relay
FC Tr1
STA
Crankshaft Position NE
Battery Sensor (NE Signal)
Starter
cmc0483
DI-175
DIAGNOSTICS - ENGINE (1GR-FE)
DTC No. DTC Detecting Condition Trouble Area
S Open or short in fuel pump relay circuit
S Fuel pump relay
P0230 Open or short in fuel pump relay circuit S Circuit opening relay
S Fuel pump
S ECM
DI-176
DIAGNOSTICS - ENGINE (1GR-FE)
WIRING DIAGRAM
I23
Ignition SW
W-R AM2 IG2 B-R ECM
7 6
9 J/C 26 8
GR-G GR-G
J26 J27 E3 MREL
1I 4
Driver Side J/B
IGN 8 23 30
8 IA9 R-G R-G R-G
EA2 IE1 E5 FPR
1K 6 W-R
W-L B-O
2 2 2 2 2 2
Engine Room R/B
C/OPN F/PMP
3 1 5 2 Relay 1 5 Relay
1
EFI F5
4
Relay Fuel
Pump
5 2 3 1 2 3 2 Resistor
2 2 2 2 2 2 2 L-O
B-W L-O
B-W
W-R B-R Y
19 J26
J/C
2 2
11 J26 2 J27
Engine Room R/B
J/C L-O 10
2 2 Y
EFI No. 1
E3 FC
AM2
28 J27
1 1 Y 3 BB4
4 L-O
2 F10
W-B Fuel Pump
A 5 W-B
J18 7 BB4
B J/C
A A W-B
W-B J3
J/C
Battery EA IF
A23582
HINT:
This diagnostic chart is based on premise that engine is started. If the engine is not started, proceed to prob-
lem symptoms table on DI-33.
DI-177
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check voltage between terminal FPR and E1 of ECM.
CHECK:
E1
Measure the voltage between terminals of E5 ECM connectors.
E5 OK:
Tester Connection Condition Specified Condition
FPR (E5-30) - E1 (E5-1) STA signal ON 9 to 14 V
FPR (E5-30) - E1 (E5-1) STA signal OFF 0 to 3 V
FPR
OK Replace ECM (See page SF-66).
B17411
NG
2 Check fuel pump relay.
PREPARATION:
Remove the fuel pump relay from the engine room R/B.
CHECK:
Inspect the fuel pump relay.
OK:
Terminal No. Condition Specified Condition
Apply B+ between
3-4 10 k or higher
terminals 1 and 2
A21024 3-4 Usually Below 1
3-5 Usually 10 k or higher
Apply B+ between
3-5 Below 1
terminals 1 and 2
NG Replace fuel pump relay.
OK
DI-178
DIAGNOSTICS - ENGINE (1GR-FE)
3 Check for open and short in harness and connector between fuel pump relay
and ECM.
Engine Room R/B: PREPARATION:
(a) Remove the fuel pump relay from the engine room J/B.
(b) Disconnect the E5 ECM connector.
CHECK:
Measure the resistance between wire harness side connectors.
OK:
Standard:
Fuel Pump Relay Tester Connection Specified Condition
Engine Room J/B (Fuel pump relay ter-
Below 1
minal 1) - FPR (E5-30)
Engine Room J/B (Fuel pump relay ter-
minal 1) or FPR (E5-30) - 10 k or higher
Body ground
A23461
E5 ECM Connector
NG Repair or replace harness or connector.
FPR B17414
OK
Replace ECM (See page SF-66).
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