EFI SYSTEM

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EF–171 DTC P1601/81 Immobilizer Signal Circuit Malfunction WIRING DIAGRAM +B EFI ECU J/C (E1) 23 (SIO2) 5 (T) 9 (SIO1) 8 KEY SW J/C #FZ QA2 #J3 +B SIO2 T KEY IMMOBILIZER ECU GND COIL(+) COIL(–) SIO1 QA6 QA4 QA5 QA3 QA8 J/C ECU-T EFI-T DLC A/T ECU etc SIO1 SG CG A/T ECU etc Antenna (IG key) J/C +B KEY QA2 #FZ IG T QA0 QA8 SIO2 #J3 SIO1 QA3 COL+ QA4 COL– QA5 GND QA6 IND QA7 IMMOBI ECU wire harness side JEF00298-00196 CIRCUIT DESCRIPTION When the IG switch is turned ON, communication starts between the immobilizer ECU and the EFI ECU. The engine can start only when the communication between the two ECUs is possible and the rolling codes are matched. In other cases, fuel injection and ignition are prohibited, thus making engine starting impossible. DTC No. P1601/81 DTC Detecting condition When any of the following items takes place in the communication between the immobilizer ECU and EFI ECU, with the IG switch turned ON: • Communication error with immobilizer ECU occurs. • The rolling codes are not matched. Trouble area • Open wire or short in immobiliger signal circuit • Immobiliger ECU • Engine ECU JEF00299-00000
EF–172 INSPECTION PROCEDURE 1 Check of harness between immobilizer ECU and EFI ECU SST Ω 1. 2. 3. Set the SST (sub-harness). (Refer to page EF–8.) Do not connect the SST connector to the EFI ECU. Disconnect the immobilizer ECU connector. Referring to page EF–48, check the harness and connector for open wire or short, with the IG switch turned OFF. • Connector QA3 at immobilizer ECU harness side- SST terminal i (SIO1) • Connector #J3 at immobilizer ECU harness side - SST terminal t (SIO2) Are the check results for open wire and short OK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Immobilizer connector (Wire harness side) #J3 QA3 YES 2 Check of immobilizer system (1) 1. 2. 3. Connect the connector of the immobilizer ECU. Replace the EFI ECU with a new one. Connect the SST connector to the EFI ECU. Start the engine with the master key. Does the engine start NO Repair or replace the harness or connector. Master key (black) NO 3 Check of immobilizer system (2) 1. 2. 3. 4. Replace the immobilizer ECU with a new one, with the IG switch turned OFF. Connect the SST to the DLC. SST: 09991-87404-000 Connect the ECU-T and the earth terminal of the SST connector with a jump wire. SST: 09991-87403-000 Start the engine with the master key. Does the engine start YES Check or replace the engine ECU. (Refer to page EF–51.) ECU-T Earth NO Check the IG key, antenna coil, etc. (Refer to section BE.) YES Check or replace the immobilizer ECU. (Refer to section BE.) JEF00300-00197
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TO INDEX EF EFI SYSTEM 1. GENERAL P
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EF-3 1.2 HANDLING INSTRUCTIONS ON C
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EF-5 3. Do not directly touch the t
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EF-7 6. In cases where the ECU was
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EF-9 3. SYSTEM DESCRIPTION 3.1 LOCA
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EF-11 3.1.3 FOR AUS AND GENERAL SPE
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EF-13 3.1.5 FOR LEADED SPECIFICATIO
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Revision 1 EF-13-2 3.1.7 FOR AUS AN
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Revision 2 EF-13-4 3. SYSTEM DESCRI
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EF-14 Revision 2 3.2 SYSTEM DIAGRAM
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EF-16 3.2.3 FOR LEADED SPECIFICATIO
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EF-16-2 Revision 1 3.2.5 FOR AUS AN
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M M Revision 2 EF-17 3.3 WIRING DIA
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M M Revision 1 EF-19 3.3.3 FOR LEAD
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Revision 2 EF-21 3.4.2 FOR AUS AND
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EF-23 4. GENERAL PRECAUTIONARY MEAS
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EF-25 4.2 FUEL PRESSURE RELIEVING P
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EF-27 3. It is possible to read out
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EF-29 11. Erasing of freeze-frame d
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EF-31 9. Updating freeze-frame data
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EF-33 5.2.1 ENGINE DIAGNOSIS FLOW C
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EF-35 5.2.4 CONFIRMATION OF REPRODU
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EF-37 5.2.5 RECHECK AND MAKING RECO
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EF-39 5.2.9 CHECK AND REPAIR BY MAT
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Revision 2 EF-41 5.4 DTC CHART SPEC
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Revision 1 EF-43 2. Codes specified
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Revision 2 EF-45 5.5 FAIL-SAFE FUNC
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EF-47 5.6 MATRIX TABLE FOR TROUBLE-
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EF-49 Short Circuit: This is caused
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EF-51 5.7.3 CHECK FOR MALFUNCTION W
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EF-53 (1) Furthermore, as regards t
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EF-55 7. The illustration shows an
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EF-57 5.9 ERASING PROCEDURE FOR DTC
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Revision 2 EF-59 5.10 BASIC ENGINE
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EF-60 Revision 2 BASIC ENGINE CHECK
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Revision 2 EF-61 BASIC ENGINE CHECK
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EF-62 Revision 2 5.11 SCAN TOOL DAT
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EF-64 5.12 CHECK OF ECU AND ITS CIR
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EF-66 System to be checked Terminal
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EF-68 Revision 2 4. Temporarily rem
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EF-70 13. Measure the amount of fue
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EF-72 INSPECTION PROCEDURE When usi
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EF-74 Correction 3 Check of MAP sen
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EF-76 INSPECTION PROCEDURE NOTE:
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EF-78 When not using DS-21 diagnosi
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EF-80 When using DS-21 diagnosis te
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EF-82 When not using DS-21 diagnosi
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EF-84 DTC P0120/41 WIRING DIAGRAM T
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EF-86 3 Check of linear throttle se
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EF-88 DTC P0130/21 WIRING DIAGRAM O
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EF-92 NO Replace the oxygen sensor
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EF-94 3 YES Check of output voltage
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EF-96 DTC P0135/23 DTC P0141/24 WIR
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EF-98 DTC P0136/22 WIRING DIAGRAM O
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EF-100 1 Are other codes (those oth
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EF-102 DTC P0171/25 System too Lean
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EF-106 NO YES 11 Check of output vo
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EF-108 DTC P0314/— Single Cylinde
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EF-110 6. Check whether there is mi
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EF-112 YES Check malfunction that o
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EF-114 1 Check of continuity of kno
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EF-116 DTC P0335/13 WIRING DIAGRAM
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EF-118 YES 3 Check the harness and
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EF-120 1 Check of resistance of cam
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EF-122 DTC P0420/27 Catalyst System
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EF-124 1 Are other codes (those oth
Page 137 and 138: EF-126 INSPECTION PROCEDURE NOTE:
Page 139 and 140: EF-128 YES 6 Check of ECU output si
Page 141 and 142: EF-130 DTC P0500/52 Vehicle Speed S
Page 143 and 144: EF-132 DTC P0500/52 Vehicle Speed S
Page 145 and 146: EF-134 DTC P0505/71 Idle Control Sy
Page 147 and 148: EF-136 YES 3 Check of input signal
Page 149 and 150: EF-138 NO 2 Check of power supply v
Page 151 and 152: EF-140 DTC P1105/32 Barometric Pres
Page 153 and 154: EF-142 Revision 1 DTC P1130/29 A/F
Page 155 and 156: EF-144 Revision 1 YES 3 Unit check
Page 157 and 158: EF-146 DTC No. P1300/36 DTC Detecti
Page 159 and 160: EF-148 5 Check of ignition signal a
Page 161 and 162: EF-150 10 Check of harness between
Page 163 and 164: EF-150-2 Revision 1 DTC No. P1300/3
Page 165 and 166: EF-150-4 Revision 1 5 Check of igni
Page 167 and 168: EF-150-6 Revision 1 10 Check of har
Page 169 and 170: EF-152 1 Check of valve timing Chec
Page 171 and 172: EF-154 1 Check of valve timing Chec
Page 173 and 174: EF-156 YES 4 Check of harness betwe
Page 175 and 176: EF-158 DTC P1510/54 Starter Signal
Page 177 and 178: EF-160 DTC P1520/51 Switch Signal C
Page 179 and 180: EF-162 3 YES Unit check of A/C swit
Page 181 and 182: EF-164 DTC P1530/44 A/C Evaporator
Page 183 and 184: EF-166 YES Check or replace the eng
Page 185 and 186: EF-168 1 Check of ECU backup power
Page 187: EF-170 INSPECTION PROCEDURE When us
Page 191 and 192: EF-174 INSPECTION PROCEDURE NOTE:
Page 193 and 194: EF-176 DTC P1656/74 OCV Circuit Mal
Page 195 and 196: EF-178 ECU Power Source Circuit WIR
Page 197 and 198: EF-180 YES 4 Unit check of IG switc
Page 199 and 200: EF-182 Revision 1 2 YES Check of po
Page 201 and 202: EF-184 5.15 UNIT CHECK 5.15.1 INTAK
Page 203 and 204: EF-186 5.15.6 LINEAR THROTTLE SENSO
Page 205 and 206: EF-188 5.15.11 IGNITOR UNIT (Only f
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EFI SYSTEM

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