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DTC P1300: IGNITOR NO. 1 CIRCUIT Toyota Sequoia I

Testing & Diagnostics 1 illustration ~747 words
CAUTIONIf Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

Circuit Description

Direct Ignition System (DIS) ignites one cylinder with one ignition coil. Ignitor is integral to ignition coil. Direct ignition system may also be referred to as distributorless ignition system. ECM determines ignition timing and outputs an ignition signal (IGT signal) for each cylinder. Based on IGT signals, power transistors in ignitor cut off current to primary coil in ignition coil, causing ignition coil to fire the spark plug. At the same time, the ignitor delivers an ignition confirmation signal (IGF signal) to ECM to verify ignition coil has fired. DTC P1300 is for ignitor on ignition coil No. 1 and is set when there is no IGF1 signal to ECM when engine is running. If DTC P1300 exists, ECM will operate in fail-safe mode. Possible causes are

  1. Ignition system malfunction.
  2. IGF1 or IGT1 circuit from ignition coil to ECM is open or shorted.
  3. Defective ignition coil with ignitor.
  4. Defective ECM.

Diagnostic Aids

Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected. If DTCs P1300, P1315, P1325 and P1330 are output simultaneously, IGF1 circuit between ignition coils and ECM may be open or shorted.

Scheme 69

Scheme 69: Diagnosis & Repair
Scheme 69: Diagnosis & Repair
  1. Check for spark at cylinder No. 1 by performing spark test. See «SPARK TEST»(ref-133197-S27511875622002021900000) under IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. Cylinder No. 1 is first cylinder back from timing belt end of engine at driver's side of engine and uses the ignition coil No. 1. If spark exists, go to next step. If spark does not exist, go to step 4.
  2. Check for open and short in Black/Red and Black/Blue wires and electrical connectors between ECM and ignition coil No. 1. See «WIRING DIAGRAMS»(ref-133228) article. ECM is located behind glove box and heater duct. see scheme 2 If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary.
  3. Disconnect electrical connector at ignition coil No. 1. Remove glove box and heater duct (if necessary) for access to ECM with electrical connectors still installed on ECM. see scheme 2 Turn ignition on. Using voltmeter, check voltage between body ground and terminal No. 27 (Black/Red wire) at ECM electrical connector E8. see scheme 4 This is the IGF1 terminal on ECM. Voltage should 4.5-5.5 volts. If voltage is within specification, replace ignition coil No. 1. If voltage is not within specification, replace ECM.
  4. Check for open and short in Black/Blue wire and electrical connectors between ECM and ignition coil No. 1. See «WIRING DIAGRAMS»(ref-133228) article. ECM is located behind glove box and heater duct. see scheme 2 If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary.
  5. Remove glove box and heater duct (if necessary) for access to ECM with electrical connectors still installed on ECM. see scheme 2 Using voltmeter, check voltage between body ground and terminal No. 11 (Black/Blue wire) at ECM electrical connector E8 while cranking engine. see scheme 4 This is the IGT1 terminal on ECM. Voltage should be more than.1 volt and less than 4.5 volts. If voltage is not within specification, go to next step. If voltage is within specification, go to step 7.
  6. Disconnect electrical connector at ignition coil No. 1. Using voltmeter, check voltage between body ground and terminal No. 11 (Black/Blue wire) at ECM electrical connector E8 while cranking engine. see scheme 4 Voltage should be more than.1 volt and less than 4.5 volts. If voltage is within specification, replace ignition coil No. 1. If voltage is not within specification, replace ECM.
  7. Using voltmeter, check voltage between body ground and terminal No. 1 (Black/Red wire) at electrical connector for ignition coil No. 1 with ignition switch in ON and START positions. (Scheme 69) Voltage should be 9-14 volts. If voltage is within specification, go to next step. If voltage is not within specification, check power supply circuit between ignition switch and ignition coil No. 1. See «WIRING DIAGRAMS»(ref-133228) article. If necessary to check IGN2 fuse (20-amp), IGN2 fuse is located in fuse box located behind driver's side of instrument panel.
  8. Check for open in Brown wire and electrical connectors between ground and ignition coil No. 1. See «WIRING DIAGRAMS»(ref-133228) article. If wiring harness and electrical connectors are okay, replace ignition coil No. 1. If wiring harness or electrical connector is defective, repair as necessary.

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